Your uncle and his sister have the same mother, your grandmother.
Your grandmother's grand father is your great great grandfather.
Your great great grandfather's son is either your great grandfather or your great great uncle.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
1st cousin 2x removed
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
you will be his great great grand son/daughter..:)
First cousins twice removed.
no problem man! enjoy
Both grandmothers are living. Their great grandmother died of cancer.
If the grandmother has custody
You are third cousins.
my brother doesn't have a son.
Your son would be the uncle of his brother's son.
That was Fred. Great guy.