ANSWER:

He must stay to prevent the khulwah and keep advising her against what she’s doing. Her husband must take necessary action and also her sister should prevent this. 

A brother asks, his mother is sometimes alone with her sister’s husband when eating in their house. The brother advised his mother but she is insistent that it’s ok. Is it better for him to leave this evil when it happens or should he stay to prevent that khulwah?

Fiqh of the family, Halal/Haram Matters | July 23, 2019 10:18 pm
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If I earn should I give my earning to my parents? Is it an obligation to a daughter to spend for her parents though they have sufficient income? My mom always threaten ,that she only spent for our studies, so we should give our earnings to her,if not we’ll be sinful. Kindly clarify this issue sheikh. May the Almighty Allah reward you.
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Does shaking hand with a non-mahram women break wudhu?