In my defense

Gavin always defends himself when I catch him in some misdeed.

Example:

Me - Gavin don't hit your sister.
Gavin - but she hit me first, or she wasn't listening to me or she did blaah blahh blaah first.

You get the idea.

Bronwyn is a fast learner. This happened this evening. Bronwyn and Gavin were laying on their little pooh couch fighting for space. Gavin cried at me and I saw Bronwyn kick him in the head. I scolded her and told her not to kick her brother. She responded, "Ganna's hair got in my kick."