Children, why they suck?

I have a 9 year old sister and she is the epitome of a brat. Brat is just written on her little forehead. All her clothes have brat undertones. Her words, if you listen closely end with Brat all of them. When she and I argue I just never want kids like ever. Terrible siblings are the best form of birth control, better than a condom, better than the pill. You won't have sex if you had a sister and brother like mine.