Sometimes kids can be so mouthy. What do you do when your kid is the one who is mouthing back at you? I can usually just give my kids that special look that parents give and they back down pretty quickly.
Oh, I have my look. Now that my older one is almost a teenager, the look sometimes doesn't work, so she just gets sent to her room until she looses her attitude.
My wife says even she's afraid when I give our son the "look". He's been really stubborn lately, so sometimes I have to add a "What did you say?" in my "angry voice" to make him realize this is battle he's already lost.