First marriage Frederick married first on 5 May 1896 at
Amalienborg Palace in
Copenhagen to
Princess Louise of Denmark, daughter of
Crown Prince Frederick of Denmark, and his wife,
Princess Louise of Sweden. The marriage was an unhappy one and Princess Louise spent much time visiting her family, staying for 2 to 3 months at a time. Her father also came and visited with her each year. Princess Louise died at Ratiboritz Castle on 4 April 1906. The official cause of death of Princess Louise was "cerebral inflammation" caused by
meningitis, after weeks of being ill. It is rumoured she attempted to
drown herself in the castle lake on her husband's estate, Ratiboritz, and caught a chill in the attempt, eventually leading to her death. Frederick and Louise had three children: •
Princess Marie Luise Dagmar Bathildis Charlotte of Schaumburg-Lippe (10 February 1897 – 1 October 1938) She married
Prince Friedrich Sigismund of Prussia and had issue. Prince Friedrich died in a riding accident after a fall from his horse. •
Prince Christian Nikolaus Wilhelm Friedrich Albert Ernst of Schaumburg-Lippe (20 February 1898 – 13 July 1974) He married his first cousin,
Princess Feodora of Denmark and had issue. • Princess
Stephanie Alexandra Hermine Thyra Xenia Bathildis Ingeborg of Schaumburg-Lippe (19 December 1899 – 2 May 1925). She married Viktor Adolf, 5th Prince of Bentheim und Steinfurt (son of
Alexis, Prince of Bentheim and Steinfurt and
Princess Pauline of Waldeck and Pyrmont) and had two sons: Prince Alexis (30 July 1922 – 2 December 1943, KIA over the Mediterranean), and Prince Christian (9 December 1923 - 12 December 2023). Stephanie died in childbirth with twin boys. Both boys died on 2 May 1925, one stillborn, the other living only a few hours.
Second marriage Frederick married a second time on 26 May 1909 at Dessau to
Princess Antoinette of Anhalt, daughter of
Leopold, Hereditary Prince of Anhalt and his wife,
Princess Elisabeth of Hesse-Kassel. Frederick and Antoinette had two sons: • Prince Leopold Friedrich Alexander Wilhelm Eduard of Schaumburg-Lippe (21 February 1910 - 25 January 2006), unmarried and without issue. • Prince Wilhelm Friedrich Karl Adolf Leopold Hilderich of Schaumburg-Lippe (24 August 1912 - 4 March 1938), unmarried and without issue. ==Honours==