fruit of (someone's) loins

Translations
плод (чьих-то) чресел
He took great pride in the achievements of the fruit of his loins.
Он очень гордился достижениями плода своих чресел.
Definitions
A phrase referring to a person's children or descendants; literally, it means the offspring produced by someone's reproductive organs (loins), but it is often used figuratively to mean one's progeny.