Your brother reminds me of my own, so I'm going to tell you what I did. I waited until I could be calm, then I told my brother that his behavior was unacceptable, and that I could not, in good conscience, allow my child to be around that. I told him that he needed to either let go of the past (for us, the situation was my brother complaining that HE never got toys from our Gramma when HE was younger, after she gave some to my son) and quit being so bitter and controlling (with another argument he picked the same day), or else I wouldn't allow him to have contact with my child. (This was before my daughter was on the way.) He was mad about it for a little bit, but he's done much better. I didn't want him out of my life, but I was protecting my children from his rather childish behavior. I think it would be fine for you to do something similar, and go ahead and mention that you don't see your hubby as being controlling, and (as a growing Christian myself) I would see it as fine to say that you appreciate him wanting your husband to be better, but that when Christ mentions the speck of dirt in another's eye, and a log in your own--well, your brother should take that to heart. Mention what it's done to your son, and that while adults should be able to rise above it, things that like can have a huge impact on children, and it's in our nature to protect our children, and you will do so if you believe it's needed (big note that it's not if your brother, your husband, or your children think it's needed-it comes to you as your decision). And, my mother loves to get in the middle of these family things, and actually she gets frustrated that I don't do the same, but I'd tell her to butt out. (Nicely, of course.) She doesn't really GET to throw in her two cents, b/c she's supposed to be neutral. Yes, it should be water under the bridge, but right now it's not, and you're trying to decide what to do and look at the situation with wisdom so opinions are not appreciated. That will ease the pressure on you, and hopefully help you see the situation without having to be so defensive, so you can decide what you really want to do. Good luck!