My sister and I were fortunately allowed to take care of our aunt and uncle's kittens (Zena and Sophie) over the week. They are sisters. Zena is the thinner and somewhat smaller--and smarter--kitten. They have become well acquainted with the downstairs area of our house and know their way to the litterbox. They do, however, have a tendency to jump on our kitchen table/counter, or the electric piano in the large room, at which we immediately shout "Zena" or "Sophie" in loud voices.
Just thought the cat lovers out there would like to know.