Take a look at
this article to get a better understanding of what a surge protector is, how it works, and why it's important to use one for your computer.
I use a surge protector for my computer devices, stereo, and television. People say that it's not too important because surges are rare, but I say my computer is more important so why take the risk? You can pick them up almost anywhere now these days and along with the protection from surges, they provide multiple outlets which is always a necessity around a computer desk.
I also doubt that his parents would know if their area is highly prone to electrical surges. That is unless they are electrical engineers or that information is readily available. I don't know of anyone who doesn't use a surge protector to plug their computer in.
Edit: Forgot link.