Filial piety is China's traditional virtue. What are the allusions about filial piety in ancient history?

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, tasting the soup and medicine eight, picking up different tools nine, burying the child to serve the mother ten, selling the body to bury the father eleven, carving wood to be kissed twelve, Yongquan Moon thirteen, leaving the orange behind the mother fourteen, Fan Pillow gentle fifteen, servant for the mother sixteen, weeping for the tomb seventeen, crying for bamboo raw bamboo shoots eighteen, lying on the ice looking for carp nineteen.