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they were cousin of each other.
Imam Sadiq S.A. is son of Imam Baqir S.A.
Imam Baqir S.A. is son of Imam Sajjad S.A
Imam Sajjad S.A is son of Imam Hussain S.A.
Imam Hussain S.A. and Imam Hasan S.A. are children of Imam Ali S.A.
In English you call him: leader of the mosque. But in Arabic you call him: Imam ul-masjid. However, most people just call him : Imam.
Imam Hasan S.A. and Imam Hussain S.A.
Imam Haniffa