Well, I didn't want to sound intrusive! It is your story!
Here are some ideas:
You could just have him disappear. Then his parents could hire a detective to hunt him down and have the detective be a means of revealing exactly what the other world Taylor disappears into actually is.
You could also just have him die from falling off a cliff into the ocean or be caught in a fire so his body would have been destoyed or lost. If it was the cliff thing, the parents would probably hire someone to search for the body. The fire would be easiest if you don't want to deal with writing parts of the story not about taylor, because everyone would assume he was dead.
I still stand by starting the story with the weird orbs. Or if not that, you can start with his disappearance. You can write a little news ad- have you seen this boy? at the beginning and start there.
Or you can use a combination of the above ideas or any other ideas you come up with. That is all these are- ideas. You're the writer. Brainstorm all the possible ways you can to start your story, pick the one you like best and run with it!