DH and I are flying out of town to visit some relatives. We will be staying with them for the weekend. I have never done this before... should we bring something to thank them for their hospitality? DH said we could offer to order pizza or something for them one night. Is that Okay?

His cousin is expecting so we will bring a baby gift too. I just don't know if we should bring something, and what bring. It's difficult since we are flying and will only have carry on luggage.