Why didn't Old Nick ever saw or interacted with the boy?
It seems strange to me. He was in charge! It is said that Ma didn't allowed him to do so, but how can that be true when she was not in charge? She was a captive, and Old Nick could do anything he wanted.
Its hard to imagine that Old Nick wasn't even curious enough, even once, to interact with his son? It is shown in the movie, it seems, that the boy never saw or met with Old Nick, I find it very absurd.