Umm Kulthum , the daughter of Fatima, was at the home of Umar ibn Khattab and he had a child from her also. When Umar was killed, she was married to Muhammad bin Jafar bin Abi Talib
Nasikh ut tawarikh, p. 47
If the Prophet (s) married his daughter to Uthman, than Ali also married his daughter to Umar.
Majalis ul Momineen, p. 89