I bought a small voice recorder and periodically ask my Dad questions about his life. "How did you meet Mom?" "How did you propose to Mom." "Why did you name your children the way you did." "Tell us about your time on Saipan during WWII." Etc., etc. I'm downloading the recordings onto my compute and eventually will transfer them to DVDs for my siblings. We started this when my Dad was 98, he is now 100. Unfortunately, we did not think of this idea until after my Mom passed away.
For both Mom & Dad (for their 90th birthdays) i created a video timeline of their lives. I gathered as many photos of them, their historical surroundings through time, etc.) as I could from whatever source (my own photo library, from my siblings, internet) and I compiled them chronologically into a video to which I added voiceover. I then downloaded it to DVDs and gave copies to my siblings. I was able to do all of this using my Apple laptop and apps that came with it.