Originally Posted by Thriftweed Fancy Pants
What if LeChuck's spell/vision was to make Guybrush believe his parents were alive?
If Guybrush is just a little kid lost in a theme park, then maybe he's been wondering why his parents haven't found him yet ("I thought you abandoned me."). Maybe he's afraid that they've died (dancing skeletons), or maybe they really did die (in the tunnels), but whether they're lost or dead, it might have sent him into a state of denial, or into an imaginary fantasy world where he's a pirate. Even if the tunnels were part of LeChuck's spell/vision, Guybrush's dream of his parents at the big tree was not. Also, why would LeChuck try to convince him that his parents are dead, and then try to convince him that they're alive? That would be counterproductive. After all, wasn't it Guybrush who exclaimed "Holy cow, these are my PARENTS!"
Maybe the dead parents were there to convince Guybrush LeChuck is actually his brother, because otherwise the voodoo doll wouldn't work. And then he showed them they were alive to help bring the message that all his adventures were a dream.