He married Countess Marie Gabriele Franziska Kálnoky de Kőröspatak in 1999. They have three children:
- Prince Moritz Emanuel Maria, who was born in New York on 27 May 2003.
- Princess Georgina Maximiliana Tatiana Maria, who was born in Vienna, Austria on 23 July 2005.
- Prince Benedikt Ferdinand Hubertus Maria, who was born in Vienna, Austria on 18 May 2008
Prince Constantin is presently 7th in line for the throne of Liechtenstein, after his two older brothers and four nephews. Females are excluded from succeding the throne in Liechtenstein.