How many kids do you have? Do they all turn out the way you expect them to be?

I'm wondering why kids raised in the same home with the same rules are entirely different from each other?
My daughter is stubborn and strong-willed. Spatting words at me is her favorite thing.
She likes to frustrate me in every way.
My son is very sweet and thoughtful. He always consoles me and lifts up my spirit.
He eases my worries and gives silver lining to make my life bearable.