Muhammad ibn Abi Bakr
He was a son of Abū Bakr aṣ-Ṣiddīq from his marriage with Asma bint Umays. When Abu Bakr died, Asma bint Umais married Ali ibn Abi Talib. Muhammad ibn Abi Bakr had a son named Qasim ibn Muhammad ibn Abi Bakr. Qasim ibn Muhammad ibn Abi Bakr's wife was called Asma and she was the daughter of Abdul-Rahman ibn Abi Bakr who was Abu Bakr's other son. The daughter of Qasim ibn Muhammad ibn Abi Bakr and Asma was called Fitima (Umm Farwah).