Wouldn't moving far away make it difficult for your children to see their dad? And even tho you think he is a lousy role model right now, you did say he was a great dad and he loved the kids.
Being separated from a parent is a huge deal to kids.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss