Kinfolk are your relatives — the people you belong to by blood or marriage. The line in some dictionaries just says “kinsfolk”, and that is the same word with an older extra s; both mean the family group. It is not the everyday word in most places. People usually say family, relatives, or folks. Kinfolk sounds a little old, rural, or story-like. You still hear it in folk songs, novels, and in some parts of the United States, especially the South, where it can feel warm, like “my people”. It is never a rude word. Kin already means family; folk means people. Put together they mean your people, your family group. You do not usually use it for one person.

親戚、親族（較文雅或鄉下口吻；日常多說家人、親戚）