So I managed to convince my sister that Zenimax had canceled Single player TES games in favor of TESO. So far she has been quite pissed off at Bethesda, Zenimax, and Zenimax Online about this whole thing. However, I don't know when I should break the ice and tell her it's all a joke? Should I tell her at a specific time or should I just wait until when (Or if???) Bethesda announces TES Vl?

Not a cruel prank, more like anyone who would believe that is both naive and doesn't know how to work the google machine.

Even though I believe you made this prank, it sounds very fake because I can't imagine someone believing in this without looking it up in the internet first.

You need to be pretty naive and foolish to believe such a thing; you'd think that someone who would have such a strong reaction would bother looking it up themselves. Just tell her and be done with it.

Actually, this was my ol' noob self those few years ago I was a svcker on believing stuff no matter the source!

Pro tip I learned: "Do not believe everything you read on the internet" -Abraham Lincoln

^^^Lol.