NOW THAT YOU MENTION IT, I don't believe Henry ever got the full talk on screen! But there was that body-swapping scene where Rumple tries to capture Pan in Pandora's box and says "blood magic works both ways, father" so he might have caught that.

MAYBE HIS MOMS FILLED HIM IN ABOUT THE REST? Either way, playing out post-Neverland is so great since you never really see Henry's reaction to that gong show, LMAO.