Dictionary / Vocabulary / 親孝行
おやこうこう
filial piety; being kind to one's parents; taking care of one's parents
common word
親孝行な息子さんがいるから、老後の心配しなくていいわね。
It must be nice having such a loyal son. You don't have to wonder if you'll be taken care of in your old age.
親孝行したいときには親はなし。
By the time you wish to be a good son, your parents are long gone.