Cat Dominance Hierarchy

There is a cat dominance hierarchy developing or developed in my home. It's the first time that I've seen it happen because it is the first time I have kept more than one cat. There are three. Well, I'm not exactly keeping three in the normal sense. One I am keeping. She is an old girl (about 16 years old), overweight, shy, quiet and a bit nervous (see picture middle right). The other two are strays. First there is Timmy. He is an athletic boy cat, youngish, great jumper, eats like a horse and sleeps like a log. He turned up several months ago and he pops in every day for food and a snooze. I don't think he considers this place home though, more a motel (he's top left on this page sleeping while being in control). Then thirdly we have Pippa, a small, mentally sharp, nervous, loving and totally black female cat who lives next door and obviously doesn't feel that happy about it because she comes to visit without any prompting whatsoever. Quite the contrary in fact