yes
anyone with even a single Jewish great-grandparent.
Your great aunt is not your great grandparent but she could be a great grandparent if she has children , grandchildren and great grandchildren.
How did the word grandparent or great grandparent come to be?
An ancestor is a parent, grandparent, great-grandparent, great-great-grandparent. To come from an ancestor you would be directly related to these people by birth.
If someone is your fourth cousin, their great great grandparent was a brother or sister of your great great grandparent.
If you adopt your own grandparent then you will be your own great grandparent and things get confusing.
Anyone who is descended from the brother or sister of one of your direct ancestors (parent, grand parent, great grandparent, etc.) is your cousin. Your first cousin is the child of your aunt or uncle. Your second cousin is the grandchild of your great aunt or great uncle (sibling of your grandparent). And so on.
It is based on the common ancestor(s). If you share a grandparent, you are first cousins. If you share a great grandparent, you are second cousins. If you share a great great grandparent, you are third cousins. If you share a 3great grandparent, you are fourth cousins. If you are at different levels of from the common ancestor, you get the how many time removed. Example, Your grandparent is their great grandparent you are first cousins once removed.
First cousins are relatives who have the same grandparent. Second cousins are relatives who have the same great grandparent Third cousins are relatives who share the same great great grandparent. If you and a relative have great grandparents who were brother and sister, then you share a great great grandparent, and are third cousins.
If your great grandparent is another person's great great great grandparent, the other person could be related to you in one of several different ways. That person could be your:grandchildgreat niece or great nephewfirst cousin, twice removedsecond cousin, twice removed
The two great grandmothers are first cousins to each other and therefore share a grandparent. That common ancestor is the great-great-great-grandparent of both Jack and Jill. * First cousins share a grandparent. * Second cousins share a great-grandparent. * Third cousins share a great-great-grandparent. * Fourth cousins share a grea-great-great-grandparent. Jack and Jill are fourth cousins to each other
The sister of ones grandparent wound be referred to as your great-aunt.