A relative by blood or marriage; a family member such as an uncle, cousin, etc.
週末は親戚の家に行って食事をした。
I went to a relative's house and had a meal over the weekend.
結婚式には親戚が大勢集まった。
Many relatives gathered at the wedding.
彼は親戚に有名な医者がいると言っていた。
He said he has a well-known doctor among his relatives.