Uncle's son has the same surname as himself, that is, the paternal line has the same surname as us, the same surname is Tang, and the different surname is Biao, so uncle's son should be called cousin or cousin.

An uncle's son is called a cousin or cousin. Generally, an uncle in the north refers to his father's brother, usually called a big uncle. My uncle's son and I are cousins, so this kind of relatives are called uncles and brothers.