Your sister and your wife's sister are not related to each other.
Sister in law
You would call your wife's elder brother's wife "sister-in-law."
Your sister in law is your husband's sister or your brother's wife.
Yes
Yes.
Probably your niece-in-law.
You're wife's brother's wife is your sister-in-law.
Yes. You can marry your LIVE wife's sister if you want to, provided that you are both free to marry.
My wifes brother in law!
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.
The English language has no relationship name for the wife of your great niece or great nephew.
There is no specific word for the husband of your wife's sister. If you need a phrase, call him your "sister-in-law's husband."