mic, sorry if I missed this - do you have an attorney?
According to the expert I have spoken with, kids that young (at least the two littlest) should not be in a 50/50 custody situation. Little guys like that need to have a home base with visitation to the other home - not two homes. As they get older, it makes sense to transition more toward a 50/50 arrangement.
Are the kids used to being with Dad as much as you? I have taken care of my kids since they were born. My H has been around, yes, but I have always been the primary caretaker by far. Suddenly shoving them (even at ages 7 and 9) into a 50/50 situation is not in their best interest.
I'm not saying that kids should be kept from their father - no way. Just remind your H, it's not about him. It's about the kids.
me: 44 XH: 42 M 11 years D10 and S8 Bomb drop 9/27/13 D final 7/1/14