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They could follow the example of Norway. Male-preference primogeniture was abolished, but only for those people born after 1990, so Haakon, Crown Prince of Norway (born 1973) still comes ahead of his older sister Princess Martha Louise (born 1971). But Haakon's daughter Princess Ingrid Alexandra (born 2004) comes before her younger brother Prince Sverre Magnus (born 2005). Since Felipe has been the heir apparent since 1975, I doubt they would revoke his position now. e 

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