Your sister is the only creature on earth who shares your heritage, history, environment, DNA, bone structure, and contempt for stupid Aunt Gertie.

If you don't understand how a woman could both love her sister dearly and want to wring her neck at the same time, then you were probably an only child.

every one of us possesses a gene predisposing us toward rivalry, competition, and fits of envy with any past, present, or future siblings.

I will not go out with a man who wears more jewelry than me, and I'll never, ever go to bed with a guy who calls me Babe. Other than that, however, I'm real flexible.

Major fluctuations in weight gain and loss are detrimental to your health and embarrassing to explain to your friends and family.

Almost everything can be construed as sexual harassment depending upon the way it is said. One general rule of thumb is to think of your female co-workers as you would your sister. Yes, she is a woman. No, she is not a sexual object. Yes, your parents probably like her more than they like you.

More than Santa Claus, your sister knows when you've been bad and good.