Increasingly over the years, the French lawyers and clerks serving Mary in England were drawn from closely related families. Du Ruisseau married Claire Nau in 1563, her younger brother
Claude Nau became Mary's secretary for the French language during her years in England.
Jérôme Pasquier, a household clerk for Mary in England was married to their daughter Madeleine Champhoun. Du Ruisseau was master of Mary's (French) accounts from 1575. His brother, Pierre Champhuon, joined Mary's French council in 1584. Claude Nau wrote twice to his brother, meaning du Ruisseau, from
Sheffield in August 1577 using cipher codes. He hoped that du Ruisseau could be promoted to be treasurer of Mary's French dowry, and that du Ruisseau would speak to his own advantage at the French court. Nau also asked him to buy some jewellery and send it to him in a sealed package (
une petite boite fermee et cachetee); a pair of bracelets in the latest fashion, and a diamond or emerald shaped like a heart or triangle. In a letter to Claude Nau,
Albert Fontenay, a diplomat and relation of Claude Nau, described M. du Ruisseau's affection to their cousin "de Beauvois" and their mutual blood relatives of the surname Nau. Du Ruisseau was going to help negotiate Fontenay's marriage to the daughter of Masuyer, another Parisian lawyer already within their family circle. ==Roles==