If parents beat their child when the child is wrong, then what should be done to the parents when they are wrong?

So one of my neighbours is a psycho person and they beat their child almost every day. Many parents of India beat their child but what that child goes through is really different (you can actually see swelling on the child's face, blood in the nose etc).

Tell me, if parents beat their child because the child is wrong then who should beat the parent when the parent is wrong?