He would be the father-in-law.
what i call my father elder brother's wife
Your father's brother is your uncle. His wife is your aunt.
He is your Father in law.
He would be the father-in-law.
mother/father in law
You would call her your stepmother.
what i call my father elder brother's wife
what i call my father elder brother's wife
you still call him DAD
A husband's stepfather is a step-father-in-law to your wife, but, if your wife is comfortable she can still call him dad and if not, she can call him by his first name.
The English language does not have a special term for the house in which a wife's father lives. You would call is, simply, my father-in-law's house.
Your brother's wife is your sister-in-law.