expression
becoming a parent makes you appreciate your own parents
Proverb expressing that one truly understands parental love and sacrifice only after having children of one's own.
子を持って知る親の恩とはよく言ったもので、自分が親になって初めて両親のありがたみがわかった。
They say 'becoming a parent makes you appreciate your own parents,' and indeed, I only understood my parents' value after I became a parent myself.
A traditional Japanese proverb. The exact origin is uncertain, but it reflects a common sentiment across cultures.