When Haroon Rashid died his son Mamoon Rashid called Imam Reza to Khorasan Bibi Masooma could not live without her brother, so she departed for Khorasan with about 45 of her brothers and cousins, and they reached Saveh. But Saveh was full of her enemies so when her entourage reached Saveh they were attached and 23 of her brothers and cousins were martyred. They included five of her brothers namely Fazal, Jaffer, Hadi Qasim and Zaid. Even Bibi Masooma was covered in blood before people from Qom came to their rescue. This made her very sad and she became very sick. Finally friends from Qom arrived in Saveh and took her party to Qom. She arrived in Qum with a notable of Qom Moosa ibn Khazraj. She survived for only 17 days and finally died in the journey away from her home Her praying place is now known as Baitunoor , located a furlong away from her eternal resting place ,and many miracles happen there every day.
I am trying to collect information on sons of Imam Musa Kazim (A.S). Most authentic sources quote Imam Musa Kazim (A.S) had either 18 or 23 sons. [ALI RAZA (A.S), IBRAHIM, ABBAS, QASIM, ISMAIL, JAFER, HAROON, HASAN, AHMAD, MOHAMMAD, HAMZA, ABDULLAH, ISHAQ, UBAIDULLAH, ZAID, FAZAL, HASAN, SULAIMAN]. Imamat was passed on to our 8th Imam Ali Raza (A.S). Does anyone know about his son Janab HAMZA?
Its really difficult to have the exact numbers of Shia's today. Most the census in Non-Shia ruled states is manipulated.