Just want to point out that if you're going to lock Frodo in your room, be sure to give your mom or someone who isn't your sister in the house a key so that if something happens, like a fire, they can get in to let Frodo out of the house. That's what I was thinking the entire time I saw anyone say to lock him in your room.
And password protect your sister... and ignore her, and if that doesn't work, smack her. ;D