SGT
On a more serious note than my previous (pointed elsewhere) post, have you thought about recording your Granddad's memories?
If you broach the subject and say that you'd like to record his experiences so that his great grandchildren and beyond might know his experiences and reflections, he may well be happy to chat. The entries in his logbook may well trigger some very detailed recollections of the circumstances of the flights that (as we all know) are far more extensive and interesting than the bland letters and numbers in the log book. My (first hand) experience with elderly family members is that earlier, precious memories come to the fore and have considerable detail and accuracy compared with later trivia.