lǎo niú shì dú
lit. an old ox licking its calf (idiom)
fig. (of parents) to dote on one's children
老
lǎo
prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity
牛
niú
ox
舐
shì
to lick
犊
dú
calf