bù yīn bù lóng,bù chéng gū gōng
姑公:婆婆,公公。指作为一家之主,对下辈的过失要能装糊涂。
《释名•释首饰》:“不喑不聋,不成姑公。”
不喑不聋,不成姑公作宾语、定语、分句;用于劝诫人
You can't be the mother-in-law or father-in-law of your son's wife unless you show youself both stuip and deaf.