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я не знал, что у

I didn't know that ... had

→ я
phrase Uncommon #22,215
I didn't know that ... had Used to introduce something you did not know someone had. The person after у is in the genitive case, and есть is often used to express possession: Я не знал, что у неё есть брат means “I didn't know that she had a brother.” Знал is masculine; a female speaker would say знала.
RU: Я не знал, что у Анны есть машина.
EN: I didn't know that Anna had a car.

Я не знал, что у Тома есть кот.

I didn't know Tom had a cat.

Я не знал, что у Тома родственники в Бостоне.

I didn't know Tom had relatives in Boston.

Я не знал, что у Тома есть сестра.

I didn't know Tom had a sister.

Я не знал, что у Тома три кошки.

I didn't know that Tom had three cats.

Я не знал, что у Тома есть брат-близнец.

I didn't know Tom had a twin brother.

Я не знал, что у Тома есть сын.

I didn't know Tom had a son.

Я не знал, что у Тома есть псевдоним.

I didn't know Tom had a pseudonym.

Я не знал, что у Тома столько кошек.

I didn't know Tom had so many cats.

Я не знал, что у Тома есть собака.

I didn't know Tom had a dog.