The tree and the wall

Trying to raise a child while keeping him or her away from the other parent for reasons which have nothing to do with that parent's ability to help raise the child is like trying to grow a tree next to a wall which is buried deep in the ground. The tree gets only half the nutrients it needs. It will inevitably struggle and will probably end up stunted. We can only hope that eventually it will grow strong enough to slowly knock your wall down and take what it needs for itself. But it should not have to. In the end, all you have done is cause it pain.