своих родственников

one's relatives

→ свой
phrase Rare #42,232
one's relatives The reflexive possessive свой agrees with родственников in the plural accusative form. It refers to the subject's own relatives.
RU: Она часто навещает своих родственников.
EN: She often visits her relatives.

Том гостит у своих родственников в Бостоне следующие три недели.

Tom is staying with his relatives in Boston for the next three weeks.

Вы знаете телефон своих родственников?

Do you know your relatives' phone numbers?

Ты знаешь телефон своих родственников?

Do you know your relatives' phone number?