- First cousin (once removed) of King Carl XVI Gustaf.
- Son of Prince Vilhelm of Sweden and Princess Maria Pavlovna.
- Nephew of King Gustaf VI Adolf, and Prins Erik.
- Grandson of King Gustaf V and Queen Victoria of Baden.
- Bequeathed Castle Mainau, on an island in Lake Constance, by his grandmother's brother, Grand Duke of Baden Frederick II and his wife Princess Hilda of Nassau.
- Great-grandson of King Oscar II and Drottning Sophia.
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