This news from Havana: The young Cuban boy rescued off the coast of Florida on Thanksgiving turned 6 today, but his birthday is overshadowed by an ongoing custody battle between the Miami relatives caring for Elián González and his father in Cuba. Cuban President Fidel Castro yesterday gave the United States 72 hours to return the child. He warned that the Cuban people are losing patience. The boy’s mother was killed along with at least nine others when their overloaded power boat sank. Elián’s father says the boy’s stepfather organized the smuggling operation without his knowledge.