What can I do to improve my ability to be less defensive?

I have gotten very angry at my brother lately at how he treats me. I have been having a hard go of his behavior, not knowing how to deal with it and taking care of my handicapped dad at the same time. Are there some ways I can choose how I react to his insults, nakedness and other creative ways to utterly annoy me? I know laughter, laughing at someone and creative comebacks are one. But is there way I can not get so angry?