What do you call your sister's mother in law?

You call her by her first name or Mrs. Whateverhernameis.

She is no relation to you.

by their name

You call them Mrs. Jones or Smith or whatever. Or you call them your sister's mother-in-law. There is no kinship terminology because there is no kinship. With terms like second cousin twice removed there is an exact degree of consanguinity. In-law relationship are limited to nuclear family - your spouse's parents and siblings.

Nope, there's no relationship or kinship. I call her mother, father, sisters, and brothers in law by their names, but ironically enough, I call her Aunts and Uncles-in-law Aunt Suzie or Uncle Joe...I guess that's because that's what I always hear them called.

In my culture we call them our aunt, because they re our mother s sister-in-law.

U c ur life is not a book why do you care about books so much. get into reality. imagining your life as book aint taken you anywhere. gotta be strong not weak and dumb. for the love of god sakes, get over your self. it aint its falut its ur. if u dont know how to call soemone. GO ASK UR MOTHER. what did ur mom teach u to do and call her. if u dont know these simple answers how will u get married and move on with ur life. its ur falut for beign nosy in books.

You use their name...they are no relation to you being an in-law of one of your siblings.

u call them by their name or Mrs. X becuase they arent direclty related to u

just call them by their name.. and if they have no idea who your talking about then say mother-in-law or etc.

i think you'd just call them by there first name and they'd just be in-laws