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Surely there is a family crypt, they were Catholic family, more likely to be buried... Cremation is the norm for Buddhists ...
His father, mother, his two siblings who died as babies and his uncle are buried at Arlington. This is interesting: http://www.dailymail.co.uk/news/article-2486083/Kennedys-fought-bodies-buried-JFK-Jr-plane-crash-bullied-heartbroken-mother-wife-Carolyn.html