Your sister's husband is your father's son-in-law.
Phillipp uncle
sisters in law
She is your sister-in-law.
Brother-in-law.
Your sister-in-law.
your brother-in-law :)
your father in law
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."
Jijaji- brother in law
mother/father in law
You can call her by her first name or if your comfortable some son-in-laws call them mom.
nephews!