I might be wrong but I'm surmising that she told him after she took him. Remember, there was a short period of time between his abduction and being found and rescued. I think during that time she probably told him the truth.
shareThis.
shareWho do you think told him? Red (when she brought him downstairs) or his real mom (after she killed Red)?
shareThere’s another theory that the boy is also a tether, and the real boy was swapped when burned in an accident
shareI think theories like this try to make a shit movie better than it was. And I'm all for that. But this movie is a dumpster fire. A fucken car crash.
shareNever mind the boy.
What about Gabe during the boat fight? He was a non believer of dopplegangers or whatever but somehow he took a chance and banged his own head on the steering wheel or whatever on the boat where he was thinking it would psychically knock out his doppleganger.
Find what you wanna find. You will be found
sharei think he banged his head to kickstart the engine.
he was hit several times with no effect on the copy.
I think YOU need to go watch that scene again. Gabe probably figured it out that the dopplegangers would feel the same pain that they do in some way like the Cobra Twins from G.I. Joe.
He fall several times, he was crawling in pain due to hits received. Not his doppleganger.
And how would the dopplegangers be able to kill them if there was such a link?
Quite selective that link ...