Sometimes it is confusing, but it's easier to keep track of when it's you - if that makes any sense (I can keep track of my System much better than I can keep track of my girlfriend's System for example).

In a way it's like keeping track of 60 friends/classmates/coworkers or something. And the ones you see the most, you're most familiar with. For example, I don't interact with the System kids very much, so I have trouble remembering some of them. Feral however, plays with the kids inside all the time, and knows all of them and always remembers everything about them.

~Ash