I think we're figuring out why we got the cat for free. Yes, our sweet little furball knows how to use the litter box, but she just chooses not to always use it. She uses it when it's convenient for her, which is about half the time. With four kids, we DO NOT need to deal with cleaning up her messes! If she doesn't get her "business" figured out, I'm afraid she'll be getting a new family. We're not willing to sacrifice our carpets for a Smelly Cat. Surprisingly, all of the kids are okay with that.
Anyone have any ideas as to how to litter box train a cat 100% of the time?