It is wonderful that you have so many diaries/letters from your ancestors. I don't think many people have that like you. I have been too busy lately to read a lot and certainly posts in French are a little more difficult for me, so I will read your posts about your grandfather in the coming weeks. It is really wonderful to read those letters 100 years or so after they are written. I wish I had letters from my ancestors, but unfortunately, I don't.
Maybe that's also why I want to write something of my own past, so my offspring could read (if they want to) a little about me.