Ahsanallahu ilaykum shaykh, my aunt’s husband (non-practicing) works in insurance. Is it permissible for us to eat their food or benefit from crops/wealth from riba money? Refusing may deeply offend them and cause huge misunderstandings. Jazakh Allah Khair.

Shaykh Ibn ‘Uthaymīn (may Allah have mercy on him) was asked: A man knows that his father's money comes from unlawful (ḥarām) sources. Is it permissible for him to eat from his father's food? And if he refrains from eating, would that be considered disobedience to the father? Answer: If the money is ḥarām in and of itself — meaning the son knows that his father stole this specific wealth from someone — then it is not permissible to consume it. For example, if you know that your father stole this particular sheep and slaughtered it, you must not eat from it, nor accept his invitation to do so. However, if the ḥarām is from his means of income — such as dealing in usury (ribā), cheating in business, or similar — then you may eat, and the sin is upon him. The evidence for this is that the Prophet ﷺ ate from the wealth of the Jews, even though they were well known for engaging in ribā and consuming unlawful earnings (suḥt). A Jewish woman in Khaybar once gifted him a poisoned sheep intending to kill him — but Allah protected him until his appointed time. A Jew also invited him to a meal of barley bread and rancid fat (old lard), and the Prophet ﷺ accepted and ate. He even purchased food for his household from a Jew and ate it with his family. ➡️ So, he may eat, and the sin is on his father. Source: “Liqa’ al-Bāb al-Maftūḥ” (Meeting #188, Q.13)