On the other hand, you are liable for the money that you and your wife have earned unlawfully, and if this money is transferred to your brother through gift or any other permissible method, the money becomes lawful for him. Shaykh Ibn ‘Uthaymeen said: “The invitation of a person who deals in Riba (usurious interest) may be accepted unless there is a benefit in not honoring such an invitation. The evidence for this is that the Prophet accepted the invitation of Jews while the Prophet was the most pious and God-fearing person, and it is known that the Jews take Riba and consume forbidden money; nevertheless, he responded to some of their invitations. This is because unlawful money is considered unlawful only for the person who earned it by a forbidden means, unless the property is in itself unlawful; as in this case, it is also forbidden for others. This is the rule supported by evidence. 'In itself unlawful' means for instance that a person stole someone else's property and then gives it as a gift to someone else. It is not permissible for the receiver of the gift to accept it if he knows that it was stolen, because the money is in itself unlawful, contrary to the money that is unlawfully earned (like the money earned from Riba or selling unlawful goods). This is because the sin in the latter case lies on the one who earns it. If the forbidden property is transferred to someone else by lawful means, it is lawful to the latter.”