To be honest, this is starting to become more of a common issue now amongst a lot of YouTube watchers.
So this time, you're not alone with this YouTube problem...........a lot of other people have been complaining in the last 4-5 days or so about the same exact thing. ****, I'm starting to have issues myself especially when I tried watching some PMC 2010 clips
You could always try dual-booting, aka the ability to boot into two different operating systems. In this case, you can dual-boot windows and mac, so this might solve your youtube problem.
Plus this will allow you to bypass the parental control issue since the software will not affect another operating system. I believe that ur dad's parental control software is only for windows so he probably can't install it on a mac os. Hope this helps :thumbs: