What you call a son of your uncle's son?

Answer 1

Your son is your uncle's grandnephew. Your uncle is your son's great uncle.

Answer 2

Your uncle's son is your first cousin. Your uncles grandson (son of his son) is your first cousin, once removed.

Answer 3

The son of your uncle would be your first cousin. A child of one of your parent's siblings (your uncle or aunt) would be your cousin.

Answer 4

Nephew

Answer 5

brother