English: “His father and his mother” — they must be equal. Until both are equal in voice, appearance, and stature.
On the daf / in context: The Gemara requires that the parents be sufficiently similar that the son’s defiance is not attributable to confusion between two different parental authorities. This is one of the conditions that makes the law practically rare.
Type of Learning
Derash requiring parity of the parents.
What Is Learned
Both parents must be equal in voice, appearance, and stature for the rebellious-son procedure to apply.