What do I call my sister's son and daughter?
your sister's daughter= your niece your sister's son= your nephew Your sister's son or daughter would be your nephew or niece respectively.
What you call sisters daughter as?
If she is your sisters daughter then she is your neice :)
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 is sisters daughter called has?
What relation is your sisters daughter to you?
your sisters daughter would be your neice and you will be there uncle or aunt if you are a boy or girl