It depends whom you ask.
Some say Muhammad(pbuh) had six children two sons and four daughters.
But we know he had at least 2 sons, Qasim, and Abdullah, and Bibi Fatima as a daughter.
A few of the other daughters mentioned above are disputed by different sects and scholars.
Imam Hussain a.s had 4 daughters and 6 sons
25
Karbala, Iraq. today many Muslims visit his holy shrine at karbala.
Just once.
Imam hassan had three sons...hazrat Qasim, hazrat Abdullah and Hazrat hasan-e-mussana. Qasim and Abdullah were martyred in the battle of Karbala. Hasan-e-mussana survived,he was a teen at the time, and later married the daughter of Imam Hussain, Fatima Sughra.
two
about 150people
Hazrat Imam Abu Hanifa ra had many students. Two of them are very famous. They are - Imam Yousaf and Imam Muhammad ra.
zeinab, Jabir ansari and Imam Sajjad S.A. and Imam Baqir S.A. and maybe some others.
imam hussain a.s married five times
1.5 million
Hazrat Adam as wept for 200 years according to hazrat imam Raza as .
Hazrat Ismail AS, Hazrat Ishaq and Hazrat Madian.