If she goes after him with both barrels, great!:) If you stay totally out of it and don't get in the middle at all, if he asks if you put her up to it she can honestly say no. That is how I have tried to be with my kids.
That MLC clouds their judgment to no end. I know, my H and I have also had the discussion about how messed up the world is and how parents have failed their kids. And here is he. I had a discussion with him about finances today (he has done the typical MLC spending thing) and I did play the kid card and let him know (as gently as I could) that the kids were doing without because of it. That did seem to strike a chord with him. Who knows if it accomplished anything lasting though. We will see.
This MLC thing is no fun. Hang in there. It really goes get easier.