Your great grandmother's brother is your great great uncle. Your parent and the grandson of your great great uncle are Second Cousins. Therefore you and the grandson of your great great uncle are Second Cousins, once removed.
1st cousin 2x removed
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
First cousins twice removed.
You are third cousins.
Both grandmothers are living. Their great grandmother died of cancer.
That was Fred. Great guy.
Your grandson is the great-nephew of your brother.
Yes, you and your great grandfather's brother's daughters are all descended from your great-great grandparents. Your great grandfather's brother is your great great uncle. His daughters are your grandfather's first cousins and your first cousins, twice removed.
Yes, That was all my great grandmothers had to work with as well as my grandmothers.
your great uncle your grandmother's brother is your parent's uncle.... and confusingly enough when your parent is related to someone of the generation older than them (their uncle) it becomes your (great uncle) great relative.
My ancestors
The singular form of great-grandmother is great-grandmother.