it great nephew :)
your uncle is your sons great uncle
The father's son is the uncle of the son of the father's daughter.
Your uncle's son is your (first) cousin.
You would be his uncle and he would be your nephew.
A man is his sister's son's Uncle. A woman is her sister's son's Aunt .
His great uncle
He would be the teachers cousin. imagine you had an uncle and he had a child . that child would be your cousin .
Your granddaughters and son have the relationship of nieces and uncle. Your granddaughters being his nieces and your son being their uncle.
Your son would be the baby's uncle. Nobody would put such a fine point on the relationship to call your son the "Step-uncle" or "Half-uncle".
Your niece's son is your great nephew. You are his great aunt (if you are a woman) or his great uncle (if you are a man).
The son of your great niece is your great great nephew. You are his great great uncle.
cousinlol