We've never had any issues with food when our Jewish friends come over. I don't think they are really strict with what the kids eat, I think it's more them right now, maybe when they are older it will change. (Last night we had one Jewish family and one Catholic family spend the night.) Around the holidays, my kids do Hanukkah stuff with them, and they do Christmas stuff when they come over. I think they have fun learning about each other's traditions.