A few clarifications
Surah Yasin - Mentions the word Imam. All Muslims believe that Prophet Muhammad had said: "To whomsoever I am Mawla, Ali is his Mawla." This hadith has been narrated in different ways by many different sources in no less than 45 hadith books of both Sunni and Shia collections. This hadith has also been narrated by the greatest collector of hadiths, al-Tirmidhi himself, 3713; as well as Ibn Maajah, 121
Dawoodi Bohra's are Ismaili muslims too -
Amman Message recognizes Ismaili's as muslims http://www.ammanmessage.com/
PS: The Amman message is the initiative of His Majesty King Abdulla II of Jordan a direct decedent of the Prophet Mohamed (PBUH) through Imam Hassan Ibne Ali (AS) , hence a member of the Ahlu Bait Ahl al-Bayt (Arabic: أهل البيت) is an phrase meaning, literally, "People of the House" or "Family of the House". Within the Islamic tradition, the term refers to the family of the Islamic prophet Muhammad. The Ahl al-Bayt are particularly important to Shia Muslims because Shias generally derive their hadiths from the Ahl-al-Bayt and their close associates.
In Shia Islam, the Ahl al-Bayt are central to Islam and interpreters of the Quran and sunnah. Shias believe they are successors of Muhammad and consist of Muhammad, Fatimah, Ali, Hasan and Husayn (known collectively as the Ahl al-Kisa, "people of the mantle") and the Imams. There are differing opinions on the scope and importance of Ahl al-Bayt. There has been much debate concerning which people constitute Ahl al-Bayt. Although there have been many disagreements, there is a consensus amongst Sunni and Shi'a Muslims that the "Ahl al-Kisa" hadith refers specifically to Ali, Fatimah, Hasan and Husayn. Mention of the Ahl al-Bayt, Muhammad's household, is present in a verse of the Qur'an as follows:
O wives of the Prophet! you are not like any other of the women; If you will be on your guard, then be not soft in (your) speech, lest he in whose heart is a disease yearn; and speak a good word.
And stay in your houses and do not display your finery like the displaying of the ignorance of yore; and keep up prayer, and pay the poor-rate, and obey Allah and His Messenger. Allah only desires to keep away the uncleanness from you, O people of the House! and to purify you a (thorough) purifying.
And keep to mind what is recited in your houses of the communications of Allah and the wisdom; surely Allah is Knower of subtleties, Aware.
—Sura Al-Ahzab (33), ayat 32-34.
Shia Muslims also support this claim with a hadith mentioned in the Sunni Ṣaḥīḥ collection. Many Sunni scholars remark that the verse of purification was revealed concerning five people: Muhammad, Ali, Fatimah, Hasan and Husayn.
'A'isha reported that Allah's Apostle (may peace be upon him) went out one morning wearing a striped cloak of the black camel's hair that there came Hasan b. 'Ali. He wrapped him under it, then came Husain and he wrapped him under it along with the other one (Hasan). Then came Fatima and he took her under it, then came 'Ali and he also took him under it and then said: Allah only desires to take away any uncleanliness from you, O people of the household, and purify you (thorough purifying)
—Sahih Muslim , The Book Pertaining to the Merits of the Companions of the Holy Prophet (Kitab Al-Fada'il Al-Sahabah), Chapter 9: Thee Merits of the Family of the Prophet  The last sentence of verse 33:33.
The tradition about this hadith goes from different sources to Fatimah, the daughter of Muhammad. She narrated that once her father visited her home, he had fever and was not feeling well, he asked for a Yemeni cloak which Fatimah brought to him and folded it around him. Later he was joined in that Yemeni cloak by his grandsons Hasan and Hussein, who were followed by their father Ali ibn Abi Talib, who was cousin and son-in-law of Muhammad. Finally Fatimah asked the permission to enter that cloak. When all five of them joined together under the cloak, Muhammad narrated the Qur'anic verse 33:33 to those under the cloak that all five of them are chosen ones, and he further stated that he wants God to keep all impurities out of reach and away from all of us. Muhammad then prayed to God to declare all five of them as his Ahlul Bayt and keep away the Najasat (impurities). God, at that request immediately sent Gabriel (Jibral) to reveal to Muhammad that all the five under the cloak are dearest and closest to God and they are Taher ("purest of the pure") without any traces of impurities.
The Hadith al-Thaqalayn refers to a saying (hadith) about al-Thaqalayn, which translates to "the two weighty things." In this hadith Muhammad referred to the Qur'an and Ahl al-Bayt ('people of the house', Muhammed's family) as the two weighty things. Although the Hadith is accepted by both Sunnis and Shi'as,
Both Sunnis and Shi'as believe that Muhammad said the following:
“ I went along with Husain b. Sabra and 'Umar b. Muslim to Zaid b. Arqam and, as we sat by his side, Husain said to him: Zaid. you have been able to acquire a great virtue that you saw Allah's Messenger (may peace be upon him) listened to his talk, fought by his side in (different) battles, offered prayer behind me. Zaid, you have in fact earned a great virtue. Zaid, narrate to us what you heard from Allah's Messenger (may peace be upon him). He said: I have grown old and have almost spent my age and I have forgotten some of the things which I remembered in connection with Allah's Messenger (may peace be upon him), so accept whatever I narrate to you, and which I do not narrate do not compel me to do that. He then said: One day Allah's Messenger (may peace be upon him) stood up to deliver sermon at a watering place known as Khumm situated between Mecca and Medina. He praised Allah, extolled Him and delivered the sermon and. exhorted (us) and said: Now to our purpose. O people, I am a human being. I am about to receive a messenger (the angel of death) from my Lord and I, in response to Allah's call, (would bid good-bye to you), but I am leaving among you two weighty things: the one being the Book of Allah in which there is right guidance and light, so hold fast to the Book of Allah and adhere to it. He exhorted (us) (to hold fast) to the Book of Allah and then said: The second are the members of my household I remind you (of your duties) to the members of my family. He (Husain) said to Zaid: Who are the members of his household? Aren't his wives the members of his family? Thereupon he said: His wives are the members of his family (but here) the members of his family are those for whom acceptance of Zakat is forbidden. And he said: Who are they? Thereupon he said: 'Ali and the offspring of 'Ali, 'Aqil and the offspring of 'Aqil and the offspring of Ja'far and the offspring of 'Abbas. Husain said: These are those for whom the acceptance of Zakat is forbidden. Zaid said: Yes." ”
Sunnis tend to view this as Sahih and have included it in Sahih Muslim
A narration attributed to Yazid b. Hayyan reports:
“ We went to him (Zaid b. Arqam) and said to him. You have found goodness (for you had the honour) to live in the company of Allah's Messenger (may peace be upon him) and offered prayer behind him, and the rest of the hadith is the same but with this variation of wording that lie said: Behold, for I am leaving amongst you two weighty things, one of which is the Book of Allah, the Exalted and Glorious, and that is the rope of Allah. He who holds it fast would be on right guidance and he who abandons it would be in error, and in this (hadith) these words are also found: We said: Who are amongst the members of the household? Aren't the wives (of the Holy Prophet) included amongst the members of his house hold? Thereupon he said: No, by Allah, a woman lives with a man (as his wife) for a certain period; he then divorces her and she goes back to her parents and to her people; the members of his household include his ownself and his kith and kin (who are related to him by blood) and for him the acceptance of Zakat is prohibited." ”
Sunnis tend to view this as Sahih and have included it in Sahih Muslim
A narration attributed to Tirmidhi reports:
“ I m leaving among you something which is very important and should be followed, you will not go astray if you get hold of it after I am gone, one part of it being more important than the other: Allah's Book, which is a rope stretched from Heaven to Earth, and my close relatives, who belong to my household. These two will not separate from one another till they come down to the reservoir, so consider how you act regarding them after my departure."
Muhammad said: "One of them (i.e. the Thaqalayn) is the Book of Allah and the other one is my select progeny (Itrat), that is family (Ahlul-Bayt). Beware of how you behave (with) them when I am gone from amongst you, for Allah, the Merciful, has informed me that these two (i.e., Quran and Ahlul-Bayt) shall never separate from each other until they reach me in Heaven at the Pool (of al-Kawthar). I remind you, in the name of Allah, about my Ahlul-Bayt. I remind you, in the name of Allah, about my Ahlul-Bayt. Once more! I remind you, in the name of Allah, about my Ahlul-Bayt." 
Volume 6, Chapter 31, Hadith No. 3788:
Zaid bin Arqam, narrated that the messenger of Allah . said: "Indeed, I am leaving among you, that which if you hold fast to them, you shall not be misguided after me. One of then is greater than the other: (First is) The book of Allah is a rope extended from the sky to the earth, and (the second is) my family, the people of my house (ahlul bait), and they shall not split until they meet me at the hawd, so look at how you deal with them after me." (Sahih).
Volume 6, Chapter 31, Hadith No. 3786:
Jibir bin Abdullah said: "I saw the Messenger of Allah during his Hajj, on the Day of Arafah (on his last pilgrimage). He was upon his camel Al-Qaswa, giving a Khutbah, so he said: O People! Indeed, I have left among you, that which if you hold fast to it, you shall not go astray: The Book of Allah (Quran) and my Family, the People of my House (Ahlul-Bait).(Sahih)
Da‘wat dhul-‘Ashīrah - Summoning the Family
Islam began when Muhammad became forty years old. Initially, the mission was kept a secret. Then three years after the advent of Islam, he was ordered to commence the open declaration of his message. This was the occasion when God revealed the verse "And warn your nearest relations,".
When this verse was revealed, Muhammad organized a feast that is known in history as "Summoning the Family — Da‘wat dhul-‘Ashīra". He invited around forty men from the Banu Hashim and asked Ali to make arrangements for the dinner. After having served his guests with food and drinks, when he wanted to speak to them about Islam, Abu Lahab ibn 'Abdul Muttalib forestalled him and said, "Your host has long since bewitched you." All the guests dispersed before Muhammad could present his message to them.
Muhammad then invited them the next day. After the feast, he spoke to them, saying:
O Sons of ‘Abdul-Muttalib! By Allāh, I do not know of any person among the Arabs who has come to his people with better than what I have brought to you. I have brought to you the good of this world and the next, and I have been commanded by the Lord to call you unto Him. Therefore, who amongst you will support me in this matter so that he may be my brother (akhhī), my successor (wasiyyī) and my caliph (khalifatī) among you?
This was the first time that Muhammad openly and publicly called the relations to accept him as the Messenger and Prophet of God, as well as being the first time that he called for a person who would aid him in his mission. At the time, no one but the youngest of them — Ali, stood up and said, "I will be your helper, O Prophet of God."
Muhammad then put his hand on the back of Ali's neck and said:
Inna hadhã akhhí wa wasiyyí wa khalífatí fíkum, fasma‘û lahu wa atí‘û — Verily this is my brother, my successor, and my caliph amongst you; therefore, listen to him and obey.
Musnad Ahmad ibn Hanbal : When the āyah "And warn your relatives of nearest kin" (26:214) was revealed, the Prophet gathered his family around him and treated 30 of them to a meal and then said: "Who is willing to guarantee my debts and commitments so that he should be with me in paradise and should be my successor from among my family." A person whom Shurayk did not name, answered: O Messenger of Allah you are like a sea, who can take charge of this responsibility. The Prophet repeated his statement to his relatives, and (Imam) 'Alī [('a)] replied: "I will undertake this responsibility."
Ahmad ibn Muhammad al-Tha'labi in his Manaqib and Tafsir, Ibn Maghazili Faqih Shafi'i in his Manaqib and Mir Seyyed Ali Hamadani in his Mawaddatu'l-Qurba (Mawadda VI) : narrate from the Second Rightly-Guided Caliph, Umar bin Khattab, who, when the Muhammed established fraternal and brotherly ties between the companions, said, 'This Ali is my brother in this world and in the hereafter. Among my descendants he is my caliph; he is my successor (vicegerent) in my community. He is the heir to my knowledge; he is the payer of my debt. What belongs to him belongs to me; what belongs to me belongs to him; his benefit is my benefit and his loss is my loss. He who is a friend of his is really a friend of mine and he who is an enemy of his is really an enemy of mine.
A narration attributed to Shu'ba reports:
“ This hadith has been narrated. on the authority of Shu'ba with the same chain of transmitters. Amir b. Sa'd b. Abi Waqqas reported on the authority of his father that Muawiya b. Abi Sufyin appointed Sa'd as the Governor and said: What prevents you from abusing Abu Turab (Hadrat 'Ali), whereupon be said: It is because of three things which I remember Allah's Messenger (may peace be upon him) having said about him that I would not abuse him and even if I find one of those three things for me, it would be more dear to me than the red camelg. I heard Allah's Messenger (may peace be upon him) say about 'Ali as he left behind hrin in one of his campaigns (that was Tabuk). 'All said to him: Allah's Messenger, you leave me behind along with women and children. Thereupon Allah's Messenger (may peace be upon him) said to him: Aren't you satisfied with being unto me what Aaron was unto Moses but with this exception that there is no prophethood after me. And I (also) heard him say on the Day of Khaibar: I would certainly give this standard to a person who loves Allah and his Messenger and Allah and his Messenger love him too. He (the narrator) said: We have been anxiously waiting for it, when he (the Holy Prophet) said: Call 'Ali. He was called and his eyes were inflamed. He applied saliva to his eyes and handed over the standard to him, and Allah gave him victory. (The third occasion is this) when the (following) verse was revealed:" Let us summon our children and your children." Allah's Messenger (may peace be upon him) called 'Ali, Fatima, Hasan and Husain and said: O Allah, they are my family." ”
Sunnis tend to view this as Sahih and have included it in Sahih Muslim
In Surah Imran - (Imran was also the name of Abi Talib - hence the Descendants of Ali Ibne Abi Talib (AS) which includes the Imam Hassan (AS) and Imam Husain (AS)
"Verily God preferred Adam, Noah and the family of Ibrahim and Imran above all His creatures.,Offsprings, one of the other." Quran 3:33-34
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