What are the so-called "twenty-four filial piety"?

One is filial piety, the other is playing with color to entertain relatives, and the third is deer milk to serve relatives.

Five, biting your finger hurts six, Lu Yishun's mother seven, pro-tasting soup and medicine eight, picking up different tools nine, burying your son and serving your mother ten, selling your body to bury your father eleven, carving wood for pro-twelve, and jumping carp in Yongquan

Thirteen, Huai Ju stayed behind, fourteen, Fan Pillow was warm, fifteen, maid was mother, sixteen, crying over the grave, seventeen, crying over bamboo shoots, eighteen, lying on the ice as carp, nineteen, choking the tiger to save his father, twenty-one, mosquitoes were full of blood, twenty-two, wet nurses were not lazy, twenty-four abandoned their official duties to find their mother.