Not vegan, but having a vegan over for dinner. help!

so, I an not vegan, but my best friend recently went vegan a year ago, with her whole family ( 5 kids and husband ). I am going to be having my LO 1st birthday soon, and want to invite then to the party but don't want then to bring their own food ( they are used to doing that but I think it's rude to expect them to). I know I could ask her good suggestions, but I honestly feel bad asking her about her vegan lifestyle all the time ( I ask out of curiosity not judging ). obviously a veggie tray will be there with hummus....but I would like a more filling snack there for them. side notes: we are on a tight budget, and it's a snack based party not a meal. ideas??