Need to know the name of this movie

As I mentioned earlier this was a very scary movie for me, and talking about scary movies when we were younger, another movie always pops to mind. I cant for the life of me remember the name or if it was an actual movie or a made for tv movie, I mentioned it to my oldest brother and he vaguely remembers it but cant remember the name either.

Anyways, its about a boy that gets left behind in the family home ( for reasons I cannot remember ) , a new family moves in and he resorts to living within the walls, the inside of the house I guess. He has all these holes in the walls and can get from room to room within these walls. He becomes besotted with the pretty teenage girl of the new family. After that all I can remember is him being found out and him jumping from behind the walls and running outside the house only to be caught ..

I think it had the name of the boy in the title but other then that I cant remember. Any one remember this crazy movie ? I would love to watch it again.

Also what was the name of the movie with Linda Blair where she goes to live with her cousin who turns out to be a vampire.. I loved that movie also... remember watching it at a sleepover. Scary stuff for its time. She also did another one where she goes to a girls detention place, jail.. and gets bullied with the famous bathroom scene that everyone always remembers .

Ahh .. the good old days.. I know that they are probably silly to watch now, but sometimes those tv movies were great , I wish they would show them again on tv, just for something different to watch instead of reality b.s.