Re: How many Daughters did Prophet(Saw) have?
because after the death of the daughters of prophet(Saw) the relation of son in laws of prophet(Saw) were cutoff: Hadhrat Uthman said, ‘alas, my grief and mourning can’t be compensated, because once the Prophet(saw) said, ‘on the day of resurrection all relationships of all persons will be cut off except my relationship’. Alas! my kinship kinship with the Prophet(saw) has been cut off. (kanzul amaal vol 6, page 379)
But this was not the case with hz ali(ra) because hz ali(ra) was the one from whom progeny of prophet(Saw) survived.
The Prophet(saw) said: “Verily, Allah, to whom belong Might and Majesty, has placed the progeny of each prophet into his backbone (Sulb), and He, Exalted, has placed my progeny into the backbone of Ali Ibn Abi Talib.” [al-Sawa’iq al-Muhriqah, by Ibn Hajar al-Haythami, Ch. 11, section 1, p239]
And moreover hz ali(ra) was already from ahlebayt since he was from banu hashim and acceptance of sadaqa was haram for him.. where as this was not the case with the other two son in laws since they were not from ban hashim.