They call it...Zentangles? Artistic meditation? While I won't deny that this sort of art is my favorite kind to do personally, there's a name and a product line for this?!
Somebody is trying to make easy money with that copyright. Either that, or they already have.
I do this kind of pen work all the time. I have one hanging on my wall. Nobody had to teach me how. I mean, I hope your sisters are having fun with it and all, but I hope they aren't spending extra money on it.
The sometime President of the Goof Off!