Henry was the grandfather of David Silver and husband of Adele Silver. Henry was the owner of the beach house in Palm Springs where David brought the gang during a weekend trip. Henry and his wife Adele were supportive of the kids having fun and the entire group seemed to like them.
David, however, felt embarrassed by all of the time they spent hanging around the kids and asked them to leave them alone. Henry and Adele had their feelings hurt, but the other kids had no problem with them hanging around. David apologized and the grandparents forgave David.
In season 7, Henry passed away and left David a quarter of a million dollars, which he used to purchase half of the Peach Pit After Dark.