great great great
Your grandaughter would call your brother her great uncle.
no...u call grand pa
Yes, your niece's daughter is your grand niece. You are her great aunt or great uncle.
Your Grand-mother's brother - would be your great-uncle
You're Great Niece or grand-niece. You are her great-uncle or great-aunt as the case may be.
He would be your grand nephew; you would be his great-aunt.
When I was growing up, it was "great uncle". We have a lot of fun with this, as in "I'm going to ask the Great Uncle Mark if I can have some ice cream." Anyway, to answer your question, we always use great uncle or great aunt when referring to those relatives.
Your nephew's son would call you his great uncle or great aunt. Some would use the terms grand uncle or grand aunt.
Technically, the sister and brother of one of your grandparents are your grand-aunt and grand-uncle. "Grand" shows that it is one generation away- the generation of your grandparents. "Great" is properly added to those generations beyond "grand." However, in common usage people generally refer to the siblings of grand parents as great-aunt and great-uncle.
There is no special term in the English language to describe a relationship between you and your nephew's wife. To her, you are just "my husband's uncle." If she has children with your nephew, they will be your great nephews and great nieces and you will be their great uncle or great aunt.
great-great uncle
Your mother's great great uncle is your great great great uncle