Hi all. First, here's my context: My Russian boyfriend and I moved to England recently. His Russian parents have written me asking how he's adapting to English life. I want to tell them he's become an absolute Englishman. Humorously, of course, but to say that he's integrated nearly completely. I feel like I could say something along the lines of "Он больше не русский, сейчас он совсем англичанин" or "Он стал английским". I'm wondering, however, if saying something like that would just end up being confusing, if not completely incorrect. Thanks as always, all.