- Mother of King Carol II and Prince Nicholas of Hohenzollern-Sigmaringen.
- Her daughter Princess Elisabeta married Marie's 2nd cousin King Georgios II, son of King George of Greece and Queen Olga.
- Great-grandmother of Crown Prince Alexander of Serbia. Mother-in-law of King Alexander of Yugoslavia, and Elena of Greece and Denmark.
- Great-granddaughter of Duke of Kent and Strathearn Prince Edward and Duchess of Kent and Strathearn.
- Grandmother of King Michael, and King Peter II of Yugoslavia.
- Sister of Grand Duchess Victoria Feodorovna of Russia.
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