Family Law Questions? Ask a Family Lawyer Online.
Hi - my name is Kirk and I'm a Family Law litigation attorney here to assist you.
If the other parent didn't disclose that the children were already covered under some other insurance policy, I would recommend that you file a motion to modify the order and relieve yourself of this obligation as there's no need for the children to have two separate policies of insurance coverage.
It may be that the court still orders you to share in the cost of the insurance, but it will likely be less than what you're paying.
I think it is definitely worth bringing this to the court's attention.