Can you imagine if the 15-20+ grandchildren each wrote a few "memories" or stories about their grandfather and put those stories into FamilySearch? With 50+ memories about him, his posterity would have a better understanding about his life. You would feel more connected to him.
Stories are so easily created in FamilySearch for all posterity to read. Would we not want to learn more about our ancestor's lives, accomplishments, challenges, talents, and so forth? Their lives may not have been too different than our own. We may even share similar traits and talents.
Another fun way to preserve those stories of living family members is to video record them talking about some topic and then share the video clip with other family members. Go one step further. Using the free Audacity app, strip the audio track from that video clip, save it as a .mp3 file and then upload that audio file to THEIR FamilySearch account so it remains with them. You may need to help them log into their FamilySearch account and attach the audio file to their PersonID.