A “cold and ruthless” President Obama abandoned his Kenyan family in their greatest hours of need, according to a new tell-all by estranged half brother Malik Obama. “He got rich and became a snob,” Malik, 62, told The Post via Skype from his home in the Kenyan village of Nyang’oma Kogelo. “What I saw was he was the kind of person that wants people to worship him. He needs to be worshiped and I don’t do that. I am his older brother so I don’t do that.” The book, “Big Bad Brother From Kenya,” a self-published memoir which Malik Obama...