First cousins once removed.
Your daughter and your sister's child are first cousins. Your daughter and your sister's grandchild are first cousins, once removed.
Your sister's daughter would be considered your niece.
Second cousins.
The relationship to you would be your cousin !
Your sister's son is your nephew. Your son's daughter is your granddaughter. Your son and your sister's son are first cousins to each other. Your son's daughter and your sister's son are first cousins once removed to each other. Your grandchild and your sister's grandshild are second cousins to each other.
No. This is a religious relationship, not a family relationship.
Your aunt is the sister of either your mother or your father. Your aunt's sister is either:your mother, and her daughter is you (if you are a girl) or one of your sisters, oranother one of your mother's sisters, and her daughter is your first cousin, or,one of your father's sisters and her daughter is your first cousin.
You are an uncle or aunt, depending on your sex. If 'y' meant you - I've no relationship with her at all
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.
Sisters
Sisters.
Your younger brother's wife's sister's daughter would be your son's cousin.