Who played the little boy?

Unless I'm mistaken, I don't see the little boy in the movie among the cast members being credited. I realise he didn't have any speaking parts, but he was certainly an integral part of the movie as he and his mother appeared pretty much throughout the entire feature as the kidnapped victims. If he wasn't, I think the boy should have been credited. Anyone know the name of this boy? I'd be interested to know if he appeared in any subsequent films