子離れ

こばなれ

parents' ability (or inability) to let go of their children

Meaning

「親離れ」だけではない。親も「子離れ」をしないといけない。

Not just 'child's independence'. Parents must also become independent of their children.
「うちのかわいい冬彦ちゃんを、あんなろくに挨拶もできないよう小娘と結婚させれるわけないでしょ。あなたから、はっきり言ってやってください」「そうだな。まぁ、いいんじゃないか？かわいいし」「いくありません。顔は関係ありません」「まぁ、そんなかっかするな。お前だって、昔は毎晩のようにディスコに行ってブイブイ言わしてたんだし」「それとこれとは別です」「同じだよ。馬鹿馬鹿しい。早く、子離れしろ」

"I'm not going to let my sweet Fuyuhiko get married to a little girl who doesn't even have basic manners. Tell him that for me." "It's not so bad. I mean, she's cute." "No, she's not. And looks don't matter." "Well, don't get all worked up about it. You used to go to the disco every night and live it up, partying hard." "That's different." "It's the same thing! This is ridiculous. You need to learn to let things go."