No, only her father-in law.
No only your spouses father is your father in law
No you didn't marry his son your sister did.
Yes! He is your father in-law
Of course,he is my father-in-law
No, ofcourse not. He is her father in law, not my.
He is also your father in law.
No, he is not related to you, he is simply your sister-in-law's father.
Yeah, he's your father in law ^_^
NO! Your father in law is your husband's father. I think your sister-in-law's father is nothing to you.
Yes ofcourse he is. Your sister in law is your wifes sister. Your wifes father is your father and law. Get it ?