If your mother suckled her 5 times or more when she was below 2 years, then she is your mahram.
If not, then she is not your mahram and you can marry her.

My mother breastfeed my cousin 1/2times during childhood.She couldn’t remeber the number of sucklings.But one of my aunt told that,this was only 1/2.not more than two. In this case,is it permissible to marry her and is there any genetical problem if I marry her.?

Breast Feeding, Mahram | June 3, 2017 4:53 am
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I wanted a clarification if you don’t mind Our house is very small and has only one exit. So, in family gatherings,both sexes sit in separate rooms, but males sit in the dining room, so when females come to take food, they can see each other. Also,the only exit is in the dining room. Is this setup still haram although the house is small?
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in islam who is financially responsible for the maintanance of an unmarried female whos closest male relatives are her brothers (heirs). Males receive a 2:1 share of their parents inheritance. As they are protectors and maintainers of women. Does this verse cover all females or only apply to wives and secondly does it exclude females who work? Be that a daughter or sister?