Interesting. Thank you

] He may, or may not, have corresponded regularly with Eleanor. (I think this would have required a level of focused self-discipline, which doesn't seem to be one of his greatest virtues.) The problem with writing is that I expect all letters crossed the General's desk first. He probably wouldn't open a letter addressed specifically to his daughter. However, he is of a nature to take a great deal of interest in whatever might be in the letter. I can see him quizzing her about what her brother had to say, and even inviting her to read it out aloud. Just how openly could they communicate under those conditions?

Yes, and I was going to bring the general’s daily complaint about luck of correspondence from his son as a proof.

] They might route letters secretly through a third party, but that doesn't seem to be in Eleanor's nature.

Right again but.. She was familiar with secrecy, covers & aliases (remember Alice?), so that might be proof of brotherly correspondence & support.
MMM Maybe I do like the Capitan after all?