I think you mean "what do you call my father's sister's daughter?"She would be your 1st cousin and your fathers niece.___________________________________________________________Niece by definition is the daughter of one's brother, sister, brother-in-law, or sister-in-law. WhileCousin is by definition the son/daughter of your uncle or aunt.Accordingly, the daughter of the sister of your father is your cousinRefer to link below
you are referring to a sisters father, his daughter
2 sisters but no brother
My father was my brother and my sister was my mother
Your sister-in-law's husband may be your brother. If so then the brother-in-law is either your husband, in which case the daughter is your daughter; or the brother-in-law is your brother, so the daughter is your niece or the brother-in-law is the brother of another sibling's spouse, in which case the daughter is still your niece If your sister-in-law's husband is not your brother, then he is not related to you and his brother-in-law's daughter is not related to you.
Cher Lloyd has a brother called Josh and two sisters called Rosie and Sophie.
Your brothers ( or sisters ) daughter is your ( niece )
He has a brother called Hugo and two sisters.
If it is your brother's child, she would be your "niece." If the daughter is not fathered by your brother, then she is your "sister in law's daughter"
rosemary.
If he is your brother in law then his sister is your sister in law. So your sister in law's daughter would be your niece.
George has 3 sisters and a brother. His sisters are called Emily, Rosie and Chelsea and his brother is called Luke