The terms grand niece and great niece mean the same thing, the granddaughter of your brother or sister. Some regions, and some people, prefer one term and some prefer the other, but both are correct and understandable terms.
There is no difference between a great uncle or aunt and a grand uncle or aunt.
It is common to see "great grandfather" and "great granduncle". It sounds somewhat strange to hear "great great father" but it isn't so strange to hear "great great uncle"
There is no difference between "great uncle" and "grand uncle." Some people prefer to use one term and some the other. Both terms refer to a brother of one of your grandparents.
grand aunt is the oldest of the great aunts
Your aunt is the sister of one of your parents. Your great-aunt is the sister of one of your grandparents.
Yes, grandniece is another word for greatniece.
There is no difference. The words are used interchangeably - some people say one in preference to the other.
Your great aunt.
Great grand aunt.Great grand aunt.Great grand aunt.Great grand aunt.
you say call me great aunt not grand aunt
Her grand great Aunt.
Your great grandmother's sister is your great great aunt (or some would say, your great grand aunt).
Tía is aunt. Bistía is great aunt or grand aunt.
Her grand great Aunt.
Your grandmother's sister is your great aunt
Great aunt; that is your grandmother's sister. Some people might call it grand aunt, although they might think you are calling them fat. :]
The aunt of a great grand niece is her aunt - the sister of her mother or father. The great grand niece has a great grand aunt, or great grand uncle, who is the sibling of one of her great grandparents. In normal conversation, such a person would usually be called "Aunt," becasue adding all those "greats" and "grands" is cumbersome and would probably just make her feel old.
He would be your grand nephew; you would be his great-aunt.