Why do families want to torture couples? when will this toxicity from families stop?

One of my friends shared that he is so pissed off his family torturing his wife.
He and his wife are madly in love with each other and she is perfect partner, but his family keeps comparing his wife to their elder daughter in law
He shared his wife doesn't say a word but he realises her pain but could not talk bcz his father keeps threatening him
He said His wife may not share bt he realises that due to family they are getting aparat.
Why do families want to torture couples? when will this toxicity from families stop?
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