While the family came from Bellefonds, in the central French department of Nouvelle-Aquitaine, Bernadin's branch settled in Chef-du-Pont, near Valognes, in Normandy.
His paternal grandfather Bernardin Gigault de Bellefonds (1580–1639) was Governor of Valognes and Caen; his grandmother Jeanne Suzanne (?–
1652) was the daughter of Henri-Robert-aux-Épaules, Lieutenant général du roi in Normandy.

Bernadin was the only child of Henri-Robert Gigault (?–
1643), also Governor of Valognes and Caen, and Marie d'Avoynes, who brought the Servigny properties into the family.
His father was one of eight and he had a wide circle of relatives in Normandy and Acquitaine.

He married Madeleine Fouquet de Chalain (1639–1716) in 1655 and they had 9 children; Jean (1660–1668), Louis-Christophe, killed at Steenkerque in 1692, Marie-Éléonore (?–
1717), Thérèse-Marie (1667–1733), Jeanne-Susanne (1665–1698), Louise (?),
Bernardine-Thérèse (?–
1717), Françoise Bonne (1676–1693) and Marie-Armande-Agnès.
His titles and estates were inherited by his grandson, Louis-Charles Bernadin (1685–1710).
While the family came from Bellefonds, in the central French department of Nouvelle-Aquitaine, Bernadin's branch settled in Chef-du-Pont, near Valognes, in Normandy. His paternal grandfather Bernardin Gigault de Bellefonds (1580–1639) was Governor of Valognes and Caen; his grandmother Jeanne Suzanne (?–1652) was the daughter of Henri-Robert-aux-Épaules, Lieutenant général du roi in Normandy.
Bernadin was the only child of Henri-Robert Gigault (?–1643), also Governor of Valognes and Caen, and Marie d'Avoynes, who brought the Servigny properties into the family. His father was one of eight and he had a wide circle of relatives in Normandy and Acquitaine.
He married Madeleine Fouquet de Chalain (1639–1716) in 1655 and they had 9 children; Jean (1660–1668), Louis-Christophe, killed at Steenkerque in 1692, Marie-Éléonore (?–1717), Thérèse-Marie (1667–1733), Jeanne-Susanne (1665–1698), Louise (?), Bernardine-Thérèse (?–1717), Françoise Bonne (1676–1693) and Marie-Armande-Agnès. His titles and estates were inherited by his grandson, Louis-Charles Bernadin (1685–1710).
Bernardin Gigault de Bellefonds