מדרש על סוטה 49:17

R. Yashiah said: Three things were told to me by R. Zeira in the name of the men of Jerusalem: A sotah (a woman suspected of infidelity) — if her husband wishes to forgive her, he may do so. A sorer umoreh — if his father and mother wish to forgive him, they may do so. An elder who rebels against beth-din — if his colleagues wish to forgive him, they may do so.

(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.