Your grandmother's sister's grandson is your second cousin.
Your great great grandmother's sister's great great grandson is your third cousin, twice removed.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
Your grandmother's sisters are your Great Aunts.
Yes, along with your grandfathers' sisters, if any.
You are third cousins.
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.
nothing
no problem man! enjoy
There is no relation between you and your grandmother's cousin-in-law's grandson.
First cousins twice removed.