Bourgmont had an affair with a married woman, Madame Tichenet, known as "La Chenette, at Fort Pontchartrain.
In 1712, Bourgmont met the daughter of the chief of the Missouria tribe near Fort Pontchartrain and accompanied her back to the Missouria village at the mouth of the Grand River in Missouri, thus beginning his long-term residence and close relationships with the Missouria.