Holidays are the occasions for breaking out special decorations and family keepsakes. Treasured ornaments, special family china and holiday serving pieces, handmade linens, and other items provide opportunities to share family history information. A handmade ornament may be a family heirloom, and telling the story of its origin reinforces and perpetuates its history from one generation to another. You might consider placing a single photograph or family album in a prominent place for people to peruse. You will be surprised at the memories and conversations photographs can evoke.
Meals are excellent times for telling stories.
You pretty much have a captive audience. Just don't monopolize the conversation, particularly in recounting details about the courthouses you have visited or your success in locating Uncle Ted's death certificate. Children adore stories. If you are a good storyteller, look for opportunities to draw the children aside to a quiet place where you can share a little family history in the form of a story. One of my favorite memories of childhood is of my aunt telling about when she was a little girl.