I also have a brother and sister from the same litter. The sister, a Burmese, follows and sometimes leads me around all day (yells at me if I'm not at my desk on time, yells at me at midday because it's time for us to go walking around the apartment). But it's her brother, a Bombay, who's intent on the bathroom - comes and scratches at the door the minute I get there, and then comes in and hangs out with me no matter what I'm doing. I've gotten disinhibited about it, since there's no choice. The more difficult moment was when he decided to leap up on my (naked) leg while I was shaving - I think the scar will heal eventually. And more recently, he's decided that he like climbing up onto my shoulders and back and sitting down and looking around. He does that in a variety of settings, but the toilet tank gives him a convenient place to climb up from. It makes for some interesting gymnastics...