So, while my Dad was watching an episode of The Simpsons on Hulu, I was on my white MacBook. Apparently, he's blaming my use on the Mac for his internet slow downs. So I switch to my Windows laptop- no problems.

So what at all can be causing the issue?

My Mom was also on the internet on a Windows netbook.

The problems that my Dad is experiencing only occur when the 30 second commercials play- not the actual show.

Stealth mode on my Mac is active.