What do you call your sister's child?
Niece if it's a female, and nephew if it's a male.
What should you call your sisters live in boyfriend. She wants him to be called brother in law but they are not married so can we call him that?
Just tell Her that you miss her and that you want her to come someday ....
What do you call your fiance's brothers and sisters?
The English language has no specific terms for the brothers or sisters of your fiance. Some might refer to them as, for example, "future brother-in-law," "sister-in-law elect," or "intended in-law,...
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What you call sisters daughter as?
If she is your sisters daughter then she is your neice :)
What we will call sisters son as?
Nephew nephew Answer If your sister had a son, then he is your nephew. (Hey, everyone, if this isn't what the person wanted for an answer can you please help me out, thanks!)