Why do we send blessings upon the Prophet and his family in the prayer and not upon the rest of the ummah?

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Check below answers in case you are looking for other related questions:
Who are Ahl al-Bayt (the members of the Prophet's family)?
I am praying for a righteous husband but nothing has happened

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Related Answers:
Du'aa' is to be made to Allaah alone
What is the benefit of praying istikhaarah when things are already decreed?
How can he claim that it is the day of ‘Arafah when he is in a country that differs with Makkah with regard to sighting the new moon?
Who are Ahl al-Bayt (the members of the Prophet's family)?
I am praying for a righteous husband but nothing has happened

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