C.W.
I was always envious of people with boys because I did not think they had to deal with sarcasim or talking back. My daughter is 6 years old and I am struggling with the same issues. I talk to her when she does it and immediately make her apologize for what she has said. I also explain that I am an adult and she should not talk to me or anyone else like that. That usually helps for the rest of the day...until she wakes up tomorrow and has to be reminded to be mannerable again. Hope that helps:0)
C.