I know this is OT, but...My neighbor's son 1st communion is this weekend. We are invited to their house after the church service for a luncheon. We are not catholic. Neighbor's entire family will be there + several friends. I am not sure what is appropriate in the way of a gift. We thought about a saving bond, but I figured I would have to have his social security # to do that. We plan to give cash, but not sure how much $. Don't want to look cheap and don't want to over due it either. Help?