- Father of King Carol II. Grandfather of King Michael, and King Peter II of Yugoslavia. Great-grandfather of Crown Prince Alexander of Serbia. Father-in-law of King Alexander of Yugoslavia, and Elena of Greece and Denmark.
- King of Romania (October 10, 1914 - July 20, 1927). He and his wife were not crowned formally until October 15, 1922.
- His daughter Princess Elisabeta married George II of Greece, son of King George of Greece and Queen Olga.
- His niece, Augusta Victoria of Hohenzollern, married King Manuel II. Manuel's father, King Carlos, was Ferdinand's cousin.
- Cousin of King Frederick August.
- 2nd cousin of Louis Grimaldi.
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