Everyone is focused on YouTube or videos. In the case of the letters, write your fathers bio then transcribe the letters and publish them on Kindle. Easy to do. Order author copies at greatly reduced cost $2-$3 dollars depending on how long the book is and what you set the Amazon cost at. Then give as gifts to family, local library or school. Then make videos based on the book. You will not make money. But the book will be out there. I am writing a second edition and doing it in hardcover with color photos to donate to libraries and schools. Not that it is that good, but as a memorial to those in the book who have passed away. Digital copies will also be available as the paper format fades away. Who knows maybe one day a great great grandchild will find the book a learn about you or your father.
All I want to do is leave a life sized image of me talking to "the audience" whom may be my grandchildren, the youngest now is less than a year old and most likely may never hear of me.
I started this thread a few daze ago and purposefully stayed away to see how it developed.
I like the idea of speaking that gets transcribed into the written word.