儿子立正跟娘走闺女立正跟爹混
[ér zi lì zhèng gēn niáng zŏu guī nǚ lì zhèng gēn diē hùn]
Sons stand at attention and follow mum; daughters stand at attention and get mixed up by dad. The description presents two family members following opposite guidance - sons should behave seriously following their mother's way of teaching; however, daughters might get into trouble due to their father's improper influence.