parent and child; parents and their children
the mutual affection [love] between 「parent and child [parents and children]
I will not consider you as my son [daughter] after today.／〔相続権を奪う〕I disinherit you as of today.
He married a woman young enough to be his daughter.
親子電話｜an extension phone
親子丼どんぶり｜a bowl of rice topped with chicken and eggs