They shared four grandparents:
Philip I of Habsburg and Juana queen of Castle and Aragon
Manual I of Portugal and Maria of Aragon
Their only child was Don Carlos.
Louis XIV and Maria Theresa were double cousins as well.
Henri IV of France and Navarre and Marie de Medicis
Philip III of Spain and Mariana of Austria
the sole surviving son of their marriage was the Grand Dauphin who married a Bavarian cousin and had three healthy sons.
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