That's great. My brother and I are sharing rent and expenses on our place while saving for a down payment on a home. He gets a kick out of being Uncle Scribbler and I'm glad to have a sober, hardworking male role model for the boys (though I do wish he'd try and Al Anon meeting, lol). Glad that's working out for you guys.
My mom is super codependent on top of being severely mentally ill. There are certain conversational landmines that I have to avoid to keep the peace with her, so I get it. And when she demonstrates unacceptable behavior I detach and get some distance. One of those "love the person, hate the disease" situations. I have developed a lot of neutral alternative outlets so I don't feel the need to share those things with her. It's disappointing, yes, I'd love to have that close, cozy mother-daughter relationship, but we have the best relationship we can under the circumstances.
Big hugs to you, LB and Brother Blossom!