On 28 May 1894 in Brussels, Karl Anton married his cousin Princess Joséphine Caroline of Belgium (Brussels 18 October 1872 - Namur 6 January 1958), daughter of Prince Philippe, Count of Flanders and his wife Princess Marie of Hohenzollern-Sigmaringen.[1] In 1909 the couple purchased Namedy castle near Andernach. Karl Anton served as a Prussian Lieutenant general during World War I and died after his return to Namedy in 1919, at age 50.
Karl Anton and Joséphine Caroline had four children:
- Princess Stephanie Josephine Karola Philippine Leopoldine Marie of Hohenzollern (8 April 1895 – 7 August 1975) she married Prince Joseph Ernst Fugger of Glött, on 18 May 1920 and they were divorced in 1943.
- Princess Marie Antoinette Wilhelmine Auguste Viktoria of Hohenzollern (23 October 1896 – 4 July 1965) she married Baron Egon Eyrl von und zu Waldgries und Liebenaich on 27 November 1924. They have four children:
- Baroness Veronika Eyrl von und zu Waldgries und Liebenaich (15 August 1926 – 13 August 1942) she died at the age of fifteen.
- Baroness Stephanie Eyrl von und zu Waldgries und Liebenaich (17 December 1930 – 19 January 1998) she married Josef von Zallinger-Stillendorf on 27 November 1950. They have four children.
- Baroness Elisabeth Eyrl von und zu Waldgries und Liebenaich (15 May 1932 – 8 July 2011) she married Bernhard Baron von Hohenbuhel gennant Heufler of Rasen on 9 August 1954. They have six children.
- Baron Carl Josef Eyrl von und zu Waldgries und Liebenaich (19 January 1935) he married Countess Isabelle Ceschi a Santa Croce on 12 April 1975. They have four children.
- Prince Albrecht Ludwig Leopold Tassilo of Hohenzollern (28 September 1898 – 30 July 1977) he married Ilse Margot von Friedeburg on 19 May 1921. They have five children:
- Princess Josephine Wilhelma of Hohenzollern-Sigmaringen (15 February 1922 – 11 July 2006)
- Princess Luise-Dorothea of Hohenzollern-Sigmaringen (9 February 1924 – 11 November 1988) she married Count Egbert of Plettenberg on 11 June 1947. They have seven children.
- Princess Rose-Margarethe of Hohenzollern-Sigmaringen (19 February 1930 – 16 February 2005) she married Edgar Pfersdorf on 15 September 1955. They have four children.
- Princess Maria of Hohenzollern-Sigmaringen (1 April 1935 – 1 April 1935) she died at one day old.
- Prince Godehard-Friedrich of Hohenzollern-Sigmaringen (17 April 1939 – 21 May 2001) he married Heide Hansen on 29 August 1971. They have two children.
- Princess Henriette Leopoldine Wilhelmine of Hohenzollern-Sigmaringen (29 September 1907 – 3 October 1907) she died at four days old.[2]