Morning Madness

How is it that the two people you love most in the whole world have the ability to drive you mad on a regular basis? You love them. You would lay down your life for them. Need a kidney? I've got 2. Shirt off my back? Take it. Honestly, you would literally walk
to the ends of the Earth and back for them. Why then, do they take me to a place that I don't want to go?
When school started this year, I made myself a promise. I vowed to be prepared the evening before each school day so that I didn't project my stress onto the children. I aspire to be Donna Reed, but more often than not I pale in comparison to Rosanne. It's an absolute challenge to get everone out the door each morning. The children are somewhat self-sufficient. They brush their own teeth, dress themselves and can even prepare a minimal amount of breakfast items. What's the problem you ask? They are brother and sister.
They love and hate each other simultaneously with a passion that can only be described as religious. It's infuriating!! One minute they are fine, giving each other flash cards at the breakfast table---the next, they are calling each other names as physically fighting. AHHHHH!!!!
I try to hold onto my temper, but more often than not they get the worst of me and I end up making someone cry before school which then ends up setting the tone for the day. I know that this is part of being siblings and Lord knows I did my share of fighting with my brother, but I can't take it anymore!!! HELP!!!!