Your kids can feel the tension, don't fool yourself into thinking yo can smile and hide it...
My advice is to take yourself AND the kids AWAY from the H as OFTEN as you can ... treat him as if he has a disease adn you don't want your kids to pick it up...
Your H's are both using your kids to get away with their cake eating... It's time to stamp that out and SHOW your spouses that you don't tolerate disrespect
Well, in my case, H does a good job of acting the part of loving family member when kids are around. Of course, having 3 teenagers, they have their own lives and are always going their separate ways anyway. So, often I feel pretty isolated with just having myself to entertain. I will be glad when classes start so I will have more to occupy my time. I don't know if EC feels this way, but if I'm home alone and reading a book (for example), I'm perfectly fine. If H is home and I'm reading a book while he's making sure to basically ignore my existence, I'm reading my book but fuming at the same time (or feeling hurt... or whatever at the moment.)
Of course, I know right now my H couldn't care less how I feel. That's what's so hard.