M.B.
I have not totally mastered it yet... but I found these things to definitely help me get closer to peacefulness: clutter-free, organize, and have areas of your home arranged in a logical, useful way. I am also a big fan of music. we've always got something playing...
Then comes the most important part, family. A place where each member can relax together OR separately. Have something to DO... boredom causes some issues in our family as well as the need for personal space and solitude sometimes. Also, a consistent schedule can help.
As a mother, I've found that "equal" one-on-one attention with my four daughters (yes, 4 daughters... stuff gets dramatic and stressful here at the drop of a feather!) really helps even things out. Also, HUGS can help. loving, listening to each other- helping each other out.
Take a deep breath and calm down right before you "bark" orders or as you are frustrated. slow things down in your mind, and try not to be impulsive. It's hard to do that, but remember that everyone gets their cues from you and easily mimics your behavior, you've gotta be the first person to change. good luck!