Louis Sédilot was a native of Montreuil-les-Bresches in Picardy, but moved to Gif-sur-Yvette, in the Île-de-France, where he worked as a gardener. He married Marie Challe or Charier about 1625; she had one daughter, Marie (1627, later married Bertrand Fafard dit Laframboise), before she died. Louis then married Marie Grimoult, also from Gif, in 1633. (both marriages took place in the church of St Rémy, pictured above.) She was the widow of Bonaventure Pagnon. We do not know the parents of either. They must have emigrated between 1633 and 1636 but did not bring little Marie with them. She was placed in a convent in the rue St-Jacques in Paris, and her father left enough money to cover her expenses for four or five years. Louis and his second wife had: Jacqueline (born 1637 in Québec city, married Jean Chénier); Adrien (1639-1715, married Jeanne-Angélique Brière); Étienne Sédilot dit Desnoyers (1640-1688, married Madeleine Carbonnet, see below); Marguérite (1641, married Jean Aubuchon dit Lespérance); Marie (1644-1687, married Julien Trottier, René Blanchet and Antoine Adhémar); and Jean (1647, married Marie-Claire de Lahogue). This last son was known as Jean Sédilot dit Montreuil and many of his descendants used Montreuil or Montroy as their surname.

Louis returned to France about 1639 to fetch his elder daughter. At that time he was working for the Compagnie Nouvelle-France, clearing forests for farmland. Between 1645 and 1660 he acquired three farms of his own. The 1667 census says that he owned 40 arpents of land, a house and three farm animals. He died January 25, 1672 in Québec city. His wife made a will in 1682, but we do not know when she died.

Étienne Sédilot dit Desnoyers married Madeleine Carbonnet (a "fille du roi," daughter of Nicolas Carbonnet and Anne Robin, from Meudon in Normandy; she arrived in 1664 and was married in August of that year, but we know nothing further about her). They had four children: Marie-Madeleine (1665, married Pierre Auclair, seventeen children); Marie-Françoise (1667, married Charles Marié); Marie-Louise (1669-1700, married Thomas Marié); and Étienne (1677-1699).

See Marié for descendants.