Children's rights--because your son is, I'm sure, hurting--are ABYSMAL in this country. He lost his mother (your wife) and his father because some random woman, frankly, kidnapped him. I'm so sorry this happened and I really hope your son finds your way back to you as soon as possible.
I also feel so bad for C's mom's ex-gf who, it looks like, raised him for the first two years.