Is a Muslim husband entitled to use part of the money from the sale of his mother-in-law's property, knowing that she suffers from Alzheimer's, after her death, given that his Christian wife sold the property and placed her mother in a private hospital, and intends to keep the money for herself after her mother's death, while giving her sister a share that she is satisfied with, and that the laws of her religion do not obligate her to divide the inheritance, and her sister agrees to whatever the wife decides?
If the money reached your wife through a permissible means according to their law, and she gifted you some of it, then it is permissible for you to accept and use it. However, if it reached her through an impermissible means, such as usurpation (ghasb), then it is not permissible for you to accept or use it, because it is unlawful wealth. In this case, you must advise her, warn her against injustice, and invite her to Islam.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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