I'm going to ice out my brother on thanksgiving day
Why would you ice out your brother?
He's really worthless. Not only does he live in my house rent-free, he also eats my food.
It's generally good to be honest with your family members about your feelings, and to push them to take more responsibility when necessary.  However, holidays are a time to come together and to put aside differences.  If you need to have a serious talk with your brother, it should happen well before, or after, the holiday season.
My brother is still a little kid.
Regardless of his age, you should still sit down and have a talk with him.