If that happened to me, I would just quit the whole family. The kids are not at fault but also not mine, the woman is a whore and a liar and deserves nothing, and jail time is better than continuing to pay her. Take out all the money you can from the bank as soon as possible and hide it somewhere, maybe even throw it away, whatever it takes for her and the state to not get it.
What money? What bank? SHUM.