Which idiot on this forum invited H to come spend time at home with the kids on Christmas?.... I don't know wtf I was thinking, other than the kids are so darned sad, and H hasn't been making much of an effort to see them, since they upset him by being unhappy with his actions.
Ok... I've only read a little on your thread. On him coming over... will there be other adults there? If not, I'd suggest inviting them over or changing the venue to anywhere else.
If he's as angry as he sounded a few posts back. Be cautious. You're in a legal battle and he will be looking to get leverage. Do not trust him to behave and you'd want witnesses to anything that happens.
For the kids... Make sure they know you love them. That you're there for them. It's not your responsibility to make things right between the EX and them. It's his. Do not cover for him or make excuses. You also shouldn't put him down or attack him (its hard I know). Always take the high road with the kids and their dad (don't put up with crap either, but be respectful about it). They'll respect you more for it and think of what you're teaching them.
Just my 2 cents...
Me: 45 W43 S7, Foster S9 (Planning to adopt post divorce) D mentioned Feb 2015, Wife served 3/24/2015. She moved out 4/15/2015.