If you’re a parent, it’s only a matter of time before you ask your husband or your girlfriend, or your mailman the million dollar question: Why do our kids fight so much? Why? This million dollar question often rears its ugly head after visiting a friend whose children love each other so much they finish each other’s sentences. Her children seem so happy together, like Prozac-happy and you just don’t get it. You begin to ask yourself, Why does (Insert friend’s name here.) kids like each other? Why do her children share toys and talk to each other sweetly …