A Double Secret from Her Sister's Husband

I didn’t want to return to my homeland, but my grandfather’s will made my children the heirs to a multi-million fortune of two families. Nobody knows what I gave birth to—by my sister’s husband. David Gorsky will take my children. Not because of a fatherly instinct, but for money. What can I offer a heartless cynic so that he doesn’t take away what’s most precious to me?