Dú chái nán shāo; dúzǐ nán jiāo.

獨柴難燒, 獨子難教。

Lit [Just as] burning a single stick of firewood is difficult, [so] is educating an “only son.”

Fig Single children tend to be spoiled.

Note [Rhyme.]

Topics CHILDREN EDUCATION ONLY CHILDREN rhyme SPOILING