I want to know the answer to the following question:
Who was the great grandson of Muhammad ibn Ali Bakr?
All the background I'm provided with is that "In 656, Muhammad ibn Abi Bakr, the son of Abu Bakr, the adopted son of Ali ibn Abi Talib, and the great grandfather of Ja'far al-Sadiq, showed some Egyptians the house of Uthman ibn al-Affan.". Is that enough to answer the question?