Thank you @Wesphilbin and @hive-131578
I am in tears now.
I found this amongst his stuff

We can't figure out why it is addressed to my brother John's wife, we think he put an R when he meant L

I have only just begun to scratch the surface of his papers and the enormous amount of detritus (he was a packrat like me... it is odd how many similarities I am finding now between us)

Thank you all so very much, I am close to tears again.