- King of Belgium (1951-1993).
- Uncle of Grand Duke Henri de Luxembourg, and King Philippe.
- Son of King Leopold III. Grandson of King Albert I and Koningin Elisabeth. Brother of King Albert II, and Grand Duchess Joséphine-Charlotte of Luxembourg.
- Great-grandson of King Frederik VIII and Dronning Louise, and King Oscar II and Drottning Sophia. Great-great-grandson of Christian IX.
- Nephew of Kronprinsesse Märtha, and 1st cousin of King Harald V. Uncle of King Philippe, and Grand Duke Henri de Luxembourg.
- Brother of King Albert II and Grand Duchess Joséphine-Charlotte of Luxembourg.
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