Gift ideas?

Je

My sister in law is coming to visit from Colombia. I'd like to get her and her two kids (5 year old girl and 3 year old boy) a few gifts. The problem is that I don't really know them/what they like at all. Also, my SIL is traveling carry on only so that limits what I can give. Any gift ideas for these 3 family members? Bonus points if I can give them something that you can only get in America.