Our Cats Are Like Rabbits

Apparently our cats have a surprising ability to multiply. That's in spite of the fact that they are both 12-year-old spayed females.

Mom now insists that we have three kitties when we really only have two. We can have both cats in our sights, and I tell her their names which she acknowledges, but she just knows there's a third. I thought that she might be thinking of cats we had years ago but she can't describe or give me the name of the mystery third.