I commend you on your work in recovery. It's unfortunate, that you feel you need to justify things to your brother. I can't fully speak to it, but I do, gain a wonderment about what leaves siblings tick, the way that they do. (just the mother in me, wondering reading this post, how I'd personally perceive such a relationship, as you express, if I saw that in my own children.) Things that leave me wondering...is it sibling competiveness? Is it concern of worrying, if they'd be susceptible to addiction, as it usually has a genetic predisposition. Are they wondering, how it affects your parents? Are they wondering, why you both aren't in the same position, currently? All kinds of things, go through my mind here.

Has your brother ever tried something like Al-anon, to learn to be a better supporter to a loved one, you, who struggles with addiction?