Looking at old pictures together can make for a unique family night experience. Everyone loves to look at old photos. These can bring back such fond family memories. You can share stories with the kids that they may have forgotten, or maybe even ones they haven't heard before. Tell them about your wedding, about when they were born, or about a favorite vacation.
Get out even older pictures, of grandparents and great-grandparents and strengthen the extended family bonds. Share your memories of these older folks, from whom you have gained much. See if there are any family resembleances.
You could even expound on this idea to put together a family photo album or scrap book. Kids love pictures, and it is a great way to build the family bond together.