What gift should I bring for my boyfriend's family when I visit?

I’m going to be staying with my boyfriend’s family for two weeks this summer, and I’d really like to get them something thoughtful and nice.They live in Belgium, so I was thinking I could give them something typically “American.” However…what is typically American? Obviously I can’t bring chocolate (Belgium is known for their chocolate…) and alcohol is iffy, because I’m 18. He also has a younger brother who is 14.