おや孝行 こうこう
oyakōkō

Noun
Suru Verb
na-Adjective

1. filial piety; being kind to one's parents; taking care of one's parents

Intransitive
Antonym of 親不孝
おや孝行 こうこうしたいときには おやはなし。
oyakōkō shitai tokiniwa oyawa nashi.
By the time you wish to be a good son, your parents are long gone.