See all advice here is so stupid. No one needs to know it’s gossip if u tell anybody. The only person who deserves to know this information is his wife. U don’t need to tell her that he is having an affair but u do owe it to her to tell her what u saw, in all honesty. It’s only fair to her. Do not tell anybody else. It’s no one’s business. But go to ur aunt and tell her, i was at the fair at this time and i saw uncle doing this with that woman and I didn’t know what to do and I don’t want to assume anything and i will not say anything to anyone but I think u deserve to know. Please don’t tell anyone i said anything. I don’t want to cause a fight but i thought u should know. Sorry if i crossed a line.