Unblocked Episodes Of South Park At School Are There Any Website Blockers That I Could Use For Certain Websites?

Are there any website blockers that I could use for certain websites? - unblocked episodes of south park at school

My oldest nephew [who go 10 years] like behind our backs and see episodes of South Park [censored] online. Is there something that we can to certain Web sites block their vision, but we can not go back, so we can get them if you want? Personally, I'm a fan of South Park, but I do not want to see my nephew. I want the site to be blocked, if he is there, but when you unlock it if I want to see one episode.

How Does anybody know where I can get something like that? Free?