I do an annual one-take video around the house with the family, just talking about what has changed. Open cabinets and show what is in them. Talk about what is going on that week and what you are looking forward to. It usually goes for 20-30 minutes.
Those videos are destined to be pure family nostalgia gold. I hope you're saving them in a format that can be easily backed up and shared with family members, both present and future.
I also suggest taking a few candid snapshots and putting them into a book at some point. Video is good, but there's something special about a physical album that you can pass down for generations. If you distribute several copies of the books to various relatives, I'd be willing to bet they'll outlast the videos in the long run.
