I'm sorry, I should have specified: German is completely fine and what I was looking for actually. I'll check out Koopmann and Kesting and I also just saw that Fischer has "Briefwechsel 1900-1949", which should cover the correspondence part I guess.
I saw Breloer's mini-series when it aired and went from there back then, so I know and read a bit about Thomas' family, even if it all seems quite long ago. (I actually scoured my bookshelves yesterday after reading this post, but alas, the only books I still have are biographies of Katia and Elizabeth.) But as you say, it doesn't cover the WWI era, so the letters you quoted were all new to me. As is "Tales of Hollywood", hadn't heard of that before.
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I saw Breloer's mini-series when it aired and went from there back then, so I know and read a bit about Thomas' family, even if it all seems quite long ago. (I actually scoured my bookshelves yesterday after reading this post, but alas, the only books I still have are biographies of Katia and Elizabeth.) But as you say, it doesn't cover the WWI era, so the letters you quoted were all new to me. As is "Tales of Hollywood", hadn't heard of that before.
Thank you for your answer!