WB Goby. I can believe it as my younger sister was just as bad. She once moved our dads car around the block and told the folks I was driving w/o permission. You need to either lock your computer up or your room.
My sister is 3 years older than me. She's 16, and she's doing stuff you say your younger sisters do.
I've changed my login password, my computer password, and I made it so my computer requires a certain password to access the internet! Oh, crazy little computer genius me