Re: Where should a girl live if her husband passed away?
There are two types of mehrams/na-mehrams
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Permanent or blood mahrams: Such as brothers, sister, father, grandfather, grandmother, uncle, son, daughter etc etc
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In-law mahrams: FIL, MIL, SIL, stepfather etc etc. They remain mehram till the time woman is in Nikkah of that person.
PS: There is 3rd type too called RADA (or person who u have shared milk with). So you become mehram with someone if nursed by same woman (some other conditions apply though)