Those are a lot of really good things your brother is doing. My dad stayed home with me for a year after I was born (we have paid parental leave in Sweden) and let me tell you, it really, really makes a difference in the realtionship with the kid. I whish more dads got the opportunity to be close to their kids, it's really important stuff.

I'm really sorry your family isn't giving him any credit for either staying sober or raising his kids, that really sucks. :(