A time capsule is “a historic cache of goods or information, usually intended as a method of communication with future people” (http://en.wikipedia.org/wiki/
You can ask everyone in the family to contribute to a time capsule. They might want to contribute a tangible item, but also encourage them to add something that will really tell about their lives now. A personal note, pictures, or a schedule of what daily life is like could be really interesting down the road. The capsule can be any container as long as it is labeled and kept sealed in a safe place. And it needn’t be sealed for long. One year, five years, or ten years, can give the observer great perspective on life.
If you want a really safe time capsule container that will last a long time, check out:
And for complete instructions on creating long term archival time capsules check out the Smithsonian Institutions ideas at:
Good luck. I'm sure it will cause lots of reflection for your family and give them a broader perspective on life--one of the best benefits of family history.