Perhaps Fidel Junior. Raul is getting on in years. But Fidel Jr. has a job...i think he is a top bureaucrat i think with Atomic Engergy Cuba. The rest of the family have senior positions with the party and government. Amazing these communist dictatorships, give them a few years in power,and they start to think of themselves as rulers, with children and cousins and etc all in top positions in government. Margaret Honecker, Mdme Caucescu, the Kim Jong Ils et al in Korea, and the Castros. 

Milovan Djilas, former buddy of Tito, turned dissident and thrown into jail for daring to suggest more freedom, artistic freedom etc, wrote about this in The New Class, his analysis of why Communism never works...why it always leads to more repression as time goes, and how the economy fails and then collapses. The king is dead, long live the communist king...er...woops...long live the friend of the worker.