Background
He was the fourth child and third (but second surviving) son of Maximilian, 2nd Prince of Dietrichstein zu Nikolsburg, and his second wife Sophie Agnes, a daughter of Wolfgang III, Count of Mansfeld-Vorderort-Bornstädt.
He was the fourth child and third (but second surviving) son of Maximilian, 2nd Prince of Dietrichstein zu Nikolsburg, and his second wife Sophie Agnes, a daughter of Wolfgang III, Count of Mansfeld-Vorderort-Bornstädt.
In 1680, Philipp Sigmund married firstly with Marie Elisabeth Hofmann, Baroness of Grünbühel-Strechau (1663 – 21 January 1705). They had three children:
Maria Anna Franziska Eva (10 August 1681 – 1704), married on 25 April 1700 to Count Johann Wenzel of Gallas. Emanuel Joseph Johann (18 March 1690 – 27 October 1703).
After 1705, Philipp Sigmund married secondly with Dorothea Josepha, Baroness Jankovská z Vlašimi (1666 – 31 May 1742).
They had no children.