She is your niece, you are her aunt or uncle.
your auntie.. your sisters father is your dad..your dads brother is your uncle..your uncles daughter is your cousin and your cousins mother is your auntie:)!
Brothers and sisters
my cousons sisters boyfriens dads nieces grandma's favorite sons dogwalkers mothers friends mum twice removed uncles daughter
Joyce Hawkins is his moms' name, Clinton Brown is his dads' name, and his sisters' name is Lyndell Bundy.
If she is your sisters daughter then she is your neice :)
A cousin.
jokes
You are each others cousins.
she would be your grandmals sisters sons daughter =)
She is your niece.
Brother-in-law