Why does the mother in this video laugh, when her son gets kneed in the balls by her daughter (who, by the looks of it, did it on purpose)?

And she KNOWS her daughter did it on purpose. Don't even fucking deny it. Yeah yeah, you can plausibly deny that it was on purpose, the same way girls and women hide ALL the fucked up selfish things they do under plausible deniability, like a snake, instead of at least OWNING them.
Why would his mother laugh at him in this moment of pain and humiliation, and at the same time reward her daughter for taking pleasure in this violation?
How does she think it feels for a boy to be kneed in his most vulnerable, intimate part, his manhood, by a girl, his sister, and to be laughed at by his mother?
Why does the fact that it's his balls, instead of any other part of his body, make it better to laugh? Because it hurts MORE? Because it is MORE embarrassing? Why is "balls = HAHA!"?
What kind of trained-seal mentality do you need to have for that? This is not a fucking cartoon, it's her son.

Why do women seem to think that even little boys have no feelings or emotional vulnerability? Why does she treat her own LITTLE son with less regard, than even she, a grown woman, would want to be treated with by others, let alone someone like her father?
Why does the mother in this video laugh, when her son gets kneed in the balls by her daughter (who, by the looks of it, did it on purpose)?
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