姻戚[inseki] relative by marriage
遠戚[enseki] distant relative
外戚[gaiseki] maternal relative
休戚[kyuuseki] weal and woe
親戚[shinseki] relative

親戚知己[shinsekichiki] relatives and acquaintances
憂戚[yuuseki] grief
縁戚[enseki] relative
親戚関係[shinsekikankei] relations
親戚眷属[shinsekikenzoku] one's family and relatives