Louis was born Daniel Sargent. He is the son of Dickery [Diggory] Sargent and Mary Oben. Dickery was an English Protestant who was from Cornwall, England.

His name was Daniel when Indians attacked their farm, killing his father and taking Daniel, his mother and his siblings captive. His mother was killed on the hill outside of town and it's believed that a week old baby was killed as well. The three oldest siblings were ransomed and returned to Massachusetts. Daniel was turned over to Philippe de Rigault, the governor general of New France. His sister Mary is believed to have stayed with the Indians.

Daniel was baptized in Montreal on 6 November 1707, and he was renamed Louis-Philippe Langlois (Daniel Sareant was considered his Protestant name). He was naturalized in May of 1710 under his new name per PRDH.

Louis married Marguerite Lavoie on 14 January 1718, in Rivière-Ouelle, Quebec. They are the parents of the following:

1) Marguerite Langlois (1719-1808) md Jean-Baptiste Gagnon

2) Jean-Francois Langlois (1720-) md Marie-Josephe

3) Madeleine Langlois (1723-1766) md Joseph Hudon