儿子立正跟妈姓闺女立正和爸混
[ér zi lì zhèng gēn mā xìng guī nǚ lì zhèng hé bà hùn]
It literally translates to 'sons stand straight and inherit mom’s surname; daughters stand up straight and live off their father'. It’s somewhat nonsensical yet humorous, playing with the concept of gender roles and family structure in an amusing way.