An old divorce

I divorced my first husband in 1997 and left everything with the understanding that it would benefit my children. I had a fairly amicable divorce and we even stayed really good friends and still are somewhat. But, he recently remarried as did I and his new wife and her daughter by a previous marriage control the house even to the point of my children being verbally abused. I feel that everything we built up including no debt and our house paid off completely will go do this new wife and ultimately her daughter and nothing to my children. I would have never left everything if I had known he would take someone else over his children. Can I open the divorce based on finalizing it under what now seems to be false pretenses?  My name is still on the warranty deeds for the house and the land since I have not signed anything to have those removed. Does that protect those items from her getting them if something were to happen to my first husband (he has had numerous health issues even during our 10 year marriage)? He and his current wife have no children togehter, my three kids are his only heirs.  

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