LOL! How many brothers did you have?
Three of us. I am the abused middle of three, all of the same gender. Between the "blessed first born male child" and mother's little baby. ;-) A girl in the middle position would offer the distinction of a different gender. Took a sociology course that looked at the middle of three of the same gender and those children inevitably turn out to be "the black sheep", which is meant in neither a good nor bad way but just that the child tends to be much different than the other two. Very interesting and dead-on in our family. It was like reading about myself. I also had very different features from the others (no glasses, blonde versus brunette, tan instead of sunburn, looked like my Mom whereas they were the spitting image of my Dad) so it is interesting to look back and understand why I truly felt different.
But getting back to my poor Mom with all that testosterone running around. I never even heard about the theory of putting the toilet seat down until I started dating!