sister in law.
Probably your niece-in-law.
Real sister, half sister, or step sister
Your sister's sister is your sister.
The wife of your first cousin is not related to you.
Your sister in law is your husband's sister or your brother's wife.
Yes
Yes.
You are not related as you do not share a common ancestor.
No relation whatsoever. You will be an aunt or uncle to your sister's child and your brother-in-law's sister will be the child's aunt, but that's as close as it gets.
Your mothers sister is your Aunt
There is no relation. Your not blood at all so your just really good friends.
You're wife's brother's wife is your sister-in-law.