Gascé was the son of unknown parents. The date and place of his birth have not been found.
He had two marriages/partners. His first wife was Alix de Montmorency. They were married, but the date and place have not been found. They had no known children.
His second wife was Ælis de Montmorency. They were married, but the date and place have not been found. They had no known children.
| Aliases |
|---|
| Gascé de Poissy |