I'm with several of you... Just sounds like his bro is a total prick who feels he hasn't gotten enough attention lately. Boom, one tweet and done, back in the spotlight, back in the news.
It's not Arods place to deal with his brother if he doesn't want to. His brother is an adult too. he should just suck it up. Arod isn't the one bringing his family issues to the spotlight. He's keeping it private.
If this is the way his brother acts Arod might have good reason to ignore him. My gut still tells me that while Arod isn't the nicest guy in the world, his family probably tried to prevent him from A-list lifestyle, or wanted more of his money spent on them. Wanting him to live like someone who never left town, visits often, and supports little bro who wants some of what big brother has.