Unfortunately, in order for the child to say so, it is necessary that he has already seen it. He doesn’t know that he can beat his mother.
and
You probably do not have children. From anywhere the child could take this and apply it to the situation, for example, dad said to him, when you are offended in the kindergarten, you do not say anything, approach and immediately be. Or he could have seen on TV how the ‘good’ beat the bad. Or in a computer game played and someone (papa, mom, friend) said " approach him and be". There are millions of options, and not all are bad. If he saw his dad beating his mom, he’t ask for it—either because it’s happening, why ask, or because it looks awful.