久病床前無孝子 [－－－－无－－]

Jyutping gau2 beng6 cong4 cin4 mou4 haau3 zi2
Pinyin jiǔ bìng chuáng qián wú xiào zǐ

Definitions (Wiktionary)
  1. proverb
    Even a filial child will eventually be fed up with taking care of a bedridden and chronically ill parent