Sometimes I feel like I may hate my cousin far too much. It might be destroying me.
Really? What makes you hate him so deeply?
He's spoiled rotten, something nobody else in my family is.
It's okay that you dislike them-you can choose which people you interact with, and if they misbehave, you can avoid them . Have you talked with his parents? They might be able to change his behavior, since he is young.
They have done nothing. I wish he would disappear.
You can be irritated with them if you feel they're super spoiled. That makes sense, and you'll never like everyone that you meet. Hatred its a bit much, though.