What is the name of your state (only U.S. law)? Kansas
If my wife withheld information from me - that she was pregnant by another man and had been cheating when she left - can that be cause to change the property division agreement? Had I known she had cheated on me, I would not have offered the division on the house value I did.
I feel like she lied by omission. At the very least, I would have insisted that she change her name.
As you've been told, you can't insist that she change her name.
There are a couple of issues here:
1. As someone else suggested, you could ask for the divorce to be set aside, but I'm not sure why you'd want to to do that. Then you'd still be married to her and have to go through the entire process all over again. The cost of doing so is likely to exceed any possible savings.
2. Kansas is an equitable distribution state. That means that the judge doesn't have to allocate property 50:50, but can change the percentage based on a number of factors (
Divorce in Kansas). One of them is simply a free-for-all clause that says the judge can make any changes to be fair if he so chooses. So, in principle, the property distribution could be changed, but in order to do so, you'd have to go back to court and point out that she was pregnant - in which case the judge might void the divorce decree - and you'd be back where you started. I'd ask your attorney, but I doubt if the property settlement would change a lot.
3. The larger factor hasn't been addressed. If she had admitted her pregnancy, you wouldn't have been able to get a divorce until after the baby was born and you'd be the legal father - paying child support for 18+ years unless you went back to court to dis-establish paternity. Even as it is, you really need to talk with your attorney. I know that if the baby were born while you were married, it's legally yours. I'm not sure whether it's legally yours because it was conceived during your marriage. You need to speak with your attorney immediately to see if you have to take action to ensure that you're not the legal father.