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parent; parents; mother and father
founder; inventor
(pet) owner
key; parent (organization); main
ancestor; forefather
dealer; banker
「親」 has another reading with different meanings.
親に感謝しなければならない。
I must be grateful to my parents.
麻雀では親が一番有利な位置だ。
In mahjong, the dealer is in the most advantageous position.
親の言うことを聞きなさい。
Listen to what your parents say.