Would informing the father about a new, more profitable usurious source, with the aim of allocating his lawful income to the first family, while the other family continues to rely on usurious income, be considered aiding in sin and participating in it, given that the father and the other family are aware of it and are not convinced of the prohibition of usury?
It is not permissible for the questioner to guide his father to the aforementioned place, as doing so constitutes guiding to evil and assisting in sin, for "the one who guides to evil is like the one who commits it." The father must be advised to abandon all usurious dealings.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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