&gt; just start thinking your identity is just a proxy for the other person&#x27;s,<p>I think that is why a lot of siblings end up doing opposite things -- ones likes math, the other start painting, one goes into the Army, the other one is anti-military. One likes to wear bright colors, the other likes all black. One goes to school on the East coast, the other goes to the West.<p>Obviously people are different and will do and like different things -- but from my circle of acquintances it goes a bit beyond that when it comes to siblings. I think at some level, that is a way for individuals to define themselves, and that is in relation to their environment -- &quot;I am who I am because I am not ...&quot;.