What is the ruling on dealing with the mother of one's wife who wears a black string on her hand and insists on causing family problems, and is it permissible for the husband to request a divorce from his wife due to her attachment to her mother, knowing that the wife is ill and the husband loves her?

If a woman wears a string to ward off evil, this is impermissible and falls under the category of wearing amulets. She should be advised kindly. She should also be advised regarding causing discord and problems, if that is proven, and the seriousness of such actions should be explained to her. A wife's attachment to her mother is natural, and honoring her is an obligation, even if the mother mistreats her. The wife is not to be blamed for this unless it leads to a dereliction of her duties towards her husband. It is not obligatory to inform the suitor of every illness the fiancée has, but only of illnesses that affect conjugal life.