Francois LaCroix was born in Normandy, France around 1641. He is listed as age 25 living in Beaupre, Canada in 1666. He married Anne Gagne daughter of Louis Gagne and Marie Michel on September 11, 1670 in St. Anne Beuapre. They had eleven children.
Their son Francois LaCroix was born about 1676. He married Barbe Montmeunier, widow of Jean Mercier on January 19, 1701.
Francois was given permission in 1723 to leave Canada with his wife and five children, to make his home in Illinois.
His five daughters were , Barbe, Marie Louise, Agnes, and Marie Josephe LaCroix.
Marie Louise married Jean Baptiste St.Gemme Beauvais. Agnes married first Louis Boisset and then Jean Baptiste Chauvin. Marie Joseph married first Jean Baptiste Gouin and secondly to Alexandre Langlois.
Their daughter Barbe LaCroix married Henry Saucier in Illinois on November 8, 1732. They had 10 children. They later moved the family to New Orleans and then to Mississippi.