I've been asked to put together slide-shows of some family members, to create a visual "life of..." story. The very first one I did five years ago, and at the time some other family members thought it would be very tacky to do so. In the end, we were able to get enough visual material to put together a very powerful remembrance, and each family member got a copy. It ended running about 20 minutes, and documents a life of 70 years, with photos starting at a very early age, through adulthood, kids, moves, grandkids, and the final long goodbye. We still watch it from time to time, and it's guaranteed to cause a box of tissues to be used up.
Following the ceremony, we had a get-together and I photographed people talking, reminiscing, sharing their emotion. There were impromptu speeches, songs of remembrance, quiet moments... That too went into the family "archives" and all got copies of whatever what shot that day. It's not about the photography, it's about people, emotion, respect, and pain. Yet pain shared, is a pain that becomes easier to endure. And after the bitterness of pain dies down, the memories live on.
But it doesn't always have to be sad. My mother-in-law said she wanted the same treatment, but she didn't want to die before we'd put together something. So for her 80th birthday, we (hey, family activity) put together a retrospective on her life. She sees her family as her achievement, and so kids and grandkids featured prominently in that one (along with the early stuff, including some great-great-grandparents shots). We had about 100 people there - and all got copies. It's becoming a family tradition...