"And he does not listen to them": This teaches that he is flogged in the presence of three.
(Devarim 21:19) "Then his father and mother shall take hold of him": We are hereby taught that he is not liable unless he has a father and a mother. These are the words of R. Meir. R. Yehudah says: If his mother were not fit for (i.e., similar to) his father, he does not become a sorer umoreh.