у него трое детей

he has three children

→ у
phrase Rare #47,364
he has three children Russian expresses possession with у него (“he has”); трое is the collective numeral commonly used with дети (“children”).
RU: Он женат и у него трое детей.
EN: He is married and has three children.

Он женат и у него трое детей.

He is married and has three children.

— 1+1 (2011)

Фердинандо женат, у него трое детей.

Ferdinando is married and has three children.

— Развод по-итальянски (1961)

Он теперь женат и у него трое детей.

He is now married and has three children.

— Париж, я люблю тебя (2006)

Ах ты, несчастная, он же женат, у него трое детей!

Oh, you poor thing, he’s married—he has three children!

— Развод по-итальянски (1961)