Consuming ill-gotten or doubtful money

The third question of Fatwa no. 8244 A 3: If I have a friend who earns his living by deception and I have to visit him because he is a relative. Am I committing a sin if I eat from his food?

A: If the food he serves is from ill-gotten money, it is unlawful for you to eat from it and if his money is mixed; some gained lawfully and some not, you may eat from it, according to the soundest opinion of the scholars.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.