Well, I think it depends on the life you lead. If you were raised in two completely different situations, I think there will be radical differences in what you each find appealing and comforting. I don't think taste is an instinctual thing. I think you gravitate towards what resonates with you more.
That library work sounds fascinating. If I ever have to give up being a nurse, or need a second job, maybe I should give it a shot. ;D