I think it's totally possible. My mom was in the middle, and her kids are all very different, so I guess we just picked up on different behaviors. i think it also depends on the order of the children (first, middle, youngest, only child, etc) i was the first child, and very outgoing and independent. my brother was the middle child, starved for attention, always doing something to get noticed (and usually injured in the process), my sister was the youngest, and she seems a lot younger now, at 15, than my brother or I (she's going to be a junior soon, but it's so hard to picture her on her own). So I guess that has a lot to do with it, because I've seen so many families with similar dynamics.