The most important way that people communicate and share information is visual. Long before the written word(s) came to life, the first data shared were visual. 40,000 years later, that is still the case. The language of today is visual, like never before. So, to address and engage with your children and grandchildren, you must address them in that medium.
Your words on camera, along with photos and mementoes from your life, become an engaging and permanent record for your family. A visual history of your life for posterity.