The Montlhéry noble house was related to the Montmorency family; Thibaud, the founder of the Montlhéry dynasty, was the brother of Bouchard II, the progenitor of the Montmorency house.
Montlhérys adelsfamilj hörde till huset Montmorency; Thibaud, grundaren av dynastin Montlhéry, var bror till Bouchard II, stamfader till huset Montmorency.