According to a doubtful source Simon III married Gertrude of Dagsburg/Dachsburg as her third husband. She was the daughter of Gertrude of Baden and Albert II, Count of Dagsburg, and heiress of the County of Dagsburg. It is more likely that it was Simon's nephew, Simon of Leiningen, son of Friedrich, that married Gertrude in 1224, and became count jure uxoris of Dagsburg in 1234, but was heirless. The line of Dagsburg-Leiningen :de:Leiningen | continued on Friedrich's side, with Simon's brother Friedrich IV. In 1215/20 Simon then married Lauretta of Upper Lorraine, daughter of "Ferry". Frederick II, Duke of Lorraine with whom he had five children:
Dietrich, married to Johanna of Aspremont. Her parentage is not clear, probably was she from a cadet branch of the Aspremont :fr:Maison d'Aspremont|. No record of children, inheritance went to his sister.
Laure, "Loretta", "Laurette". She succeeded Simon as the Countess of Saarbrücken and married Gottfried/Geoffroi II of Aspremont :de:Gottfried II. von Aspremont|, son of Gobert VI of Apremont :de:Gobert VI. von Apremont| and secondly in 1252 to Dietrich I Luf of Cleves :de:Dietrich Luf I. |, a junior son of Dietrich V, Count of Cleves. Both husbands entered as counts jure uxoris from 1243 to 1259 when Dietrich turned back to Cleves. Loretta and Dietrich had a young daughter, Richardis, that was not yet married, and Loretta let her sister Mathilde inherit the county. Richardis married 1285 to Gerlach II Herr of Dollendorf and Kronenburg, probably son of Gerlach I of Dollendorf, and they had at least one child.
Johanna, married to Simon V , Seigneur of Clefmont-en-Bassigny :fr:Maison de Clefmont|. They had children.
Mathilde, succeeded Laure as the Countess of Saarbrücken in 1270.
*She married Simon III? of Commercy , son of Gaucher I :fr:Gaucher Ier de Broyes-Commercy|, Seigneur of Broyes-Commercy, who was succeeded by Simon's brother Gaucher II in Commercy, while Hugues, the elder brother of Gaucher I, had had Broyes from their mother Agnès of Broyes. It is not clear if Simon actually was a Seigneur of Commercy, but at least the title came to his descendants.
**Simon IV, Count of Saarbrücken. He married twice and founded the House of Saarbrücken-Commercy :fr:Seigneurie de Commercy|, having both fiefs as inheritance in 1274. His son Jean I :fr:Jean Ier de Sarrebruck-Commercy|, succeeded as Count of Saarbrücken. Jean also succeeded Simon IV as Seigneur of Commercy in 1297.
**Jaquemin of Saarbrücken, a cleric.
**Friedrich, "Frederick", Seigneur of Commercy :fr:Seigneurie de Commercy| ?.
*As a widow Mathilde married in c.1248 to Amadeus :fr:Amédée III de Montfaucon|, Seigneur of Montfaucon, and had:
**Jean :fr:Jean Ier de Montfaucon|, Seigneur of Montfaucon, Orbe and Échallens. He married twice, to Marguerite of Châteauvillain,, and Isabeau of Melun, but without issue.
**Gauthier II :fr:Gauthier II de Montfaucon|, Seigneur of Vuillafans-le-Vieux, later Seigneur of Montfaucon. Me married Mathilde of Chaussin, Dame of La Marche and had about six children, including Henry I, Count of Montbéliard.
After the death of his son Dietrich in 1227, he chose Laurette as his heiress as Countess of Saarbrücken, with an official statement in 1235 with the Bishop of Metz, and gave a part of the county to each of the daughters. Mathilde gained the title as Countess of Saarbrücken, but the inheritance was contended by Bishop Lorenz von Leistenberg, and first Mathilde's son Simon IV could safeguard their reign after her death, and the House of Saarbrücken-Commercy prevailed until 1381, when the male line became extinct.
