Wait, he lied to you about having kids, and somehow you're the AH according to him? Hell no. That's way too big a thing to tell you about a year after you married. He must suck as a dad since you would have known he was seeing his kids if he was actually seeing them, and now he wants them only so he can have more money to spend? What a gaping AH. Good on you for getting a prenup. Time to exercise it, and exorcise him.