I have a friend who his parents aren’t ahlul kittab someone told him he cannot eat food from them because its not halal . Even tho the mother cooks only halal for him and he is scared of najasi. Whats sistanis point of view on this

If one is not certain about the food being touched with wet hands of such person then one can eat such persons food. The only situation is when one has the knowledge and the certainty of such food touched with wetness.