Re: need to know for the sake of knowledge
Peace safaf_0!
1- Hazrat Zainab (RA) was married to her cousin (both of them embraced Islam)
[INDENT]She was married with her (chacha-zad bhai) Hazrat Abu Al’As bin Rabih 
who was son of Hazrat Hala :RA:. Hazrat Hala :RA: is sister of Hazrat Khajida from Quraish.
[/INDENT]2- Hazrat Ruqaya (RA) was married to Hazrat Usman (RA)
[INDENT]She was also wedlock with ‘Utba’ s/o Abu-lahab who divorced her before ‘rukhsati’ because his father (abu-lahab). Our Prophet Muhammad 
wed locked Hazrat Ruqaiya with Hazrat Usman Ghani both couples were famous by given nick ‘Sahib Al Hijrataain’ (two hijrat [migrate] walain).
[/INDENT]**3- Hazrat Umme Kalsum (RA) was also married to Hazrat Usman (RA) (after the death of Hazrat Ruqaya) **
[INDENT]She was in wedlock of Abu-lahab’s son 'Ateeba but left her beacuse of his father. After death of Hazrat Ruqayya our Prophet Muhammad married her with Hazrat Usman Hazrat Usman is from Banu-Ummia (Quraish) and famous by nick ‘Sahib-e-kounain’.
[/INDENT]4- Hazrat Fatima (RA) was married to Hazrat Ali (RA)
[INDENT]She wedlock with Hazrat Ali in 2 hijri.
Hazrat Ali ibn-e-talib was brother (chacha-zad bhai) of our Prophet Muhammad and He is from Quraish (Bani-Hashim).
[/INDENT]*References: *
a) Serat-e-Mustafa (Zarqani Jild 3)
b) Tareek-ul-Islam (Ahd-e-risalat wa Khilafat-e-Rashida wa ahd-e-bani Ummiya)