"What about your father? He is a famous dentist, but your little brother has only one tooth! " what's the meaning

John: "Your father is like a miser. You see, he is a shoemaker, and you still wear such worn shoes. " Your father is a shoemaker and doesn't want to make himself a better pair of shoes.

Tom: "What about your father? He is a famous dentist, but your little brother has only one tooth! " Your father is a dentist, but he can't bear to see the child's teeth, so he only has one tooth.