Your father's sister is your aunt. You are her niece (if you are a girl) or her nephew (if you are a boy).
He had a good relationship with his sister
You sister-in-law is your son's aunt. the relationship consider age diff.if she is lower age what is his relationship.
My relationship with a friend's sister is friendly and respectful.
pastor
I am a third-party voice and do not have a relationship with your friend's sister.
Your husband's sister is your sister in-law.
Jeremy
she is his younger sister
Your sister's daughter is your niece.
Your Mother's Sister Is Your Aunt.
Your sister and your wife's sister are not related to each other.
There is no relationship at all.