Im not saying they are in harm- but if she is only providing 'okay' care and I can provide 'better than okay' I willing to go to court for it. I'm also worried that this will cause huge setbacks in the co-parenting relationship because she will not accept that I want to become primary.
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Well, I can guarentee a massive setback...and probably little to no chance of recovery of that relationship. A good co-parenting relationship seems to be rare - and should be treated like gold if you are lucky enough to have cultivated one.
I am well aware of the fact that I, myself, moved around a bit after my divorce - I didn't keep the house, my ex did, and he hasn't had to move once...and I hated each time I had to pick up and move either due to space or funds. I had a couple failed relationships, my income is 1/5th my ex's, I'm not a VP like him, I can't work from home when needed like him, I don't have a wife who can do the same like he does...but he always refrained from announcing to me that he feels he is the better more stable parent and therefore should have primary custody, not shared. I am aware of my shortcomings - as I am aware of his....and if he EVER decided to get a burr up his self-rightous butt and fight to strip me of my custody - he would have the fight of his life and it would completely decimate years of a carefully built coparent relationship.
Think long and hard before you basically tell your ex that she is not a good enough mother for your children, and put another woman in her place in thier lives. You could be the one that ends up losing in the long run...

. Tread carefully...