By some of the comments made here, this is the proper protocol when you hear glass breaking in the middle of the night: 1) leave your gun where it is; 2) call 911; 3)turn on the light to see who it is; 4)sit back and do nothing while the person attacks you.

If the brother's intentions were completely innocent, he would have knocked on the door instead of breaking the glass. The shooter was justified in protecting himself.