Peanut allergy

So my husbands mom gave him peanut butter around the age of one and he had a bad reaction. The doctors told her not to give him anymore. Well everyone knows you’re not supposed to give nuts to young children until a certain age or they will have a reaction. Well he’s grown up never eating peanuts. We went to

Chick fil a a while ago and he was fine. Then we went back and he noticed the menu says that they fry their food in peanut oil. So he freaked out saying he can’t eat and. I was thinking 🙄 but you have before. Is it me or does it sound like he’s really not allergic?! Lol I don’t expect him to go eat a whole bag of peanuts but I’ve tried explaining to him that he doesn’t have a life threatening allergy like he thinks lol