Maybe this will help: It's from Kaskaskia Under the French Regime by Natalia Belting:
From Natalia Belting
There was another family of Lalandes in Illinois at the same time, that of Jean Baptiste Guillemot dit Lalande, son of Jacques François Guillemot and Madeleine Dupont, baptized at Montreal July 18, 1694. [Tanguay, V. 417]. He married Catherine Ouabanakicoue, an Indian, the widow of Louis Texier, marguiller of Kaskaskia, who died at Natchez, June 3, 1721.
A son, Marc Antoine, was born October 7, 1723, and baptized October 20 with Marc Antoine de la Loëre des Ursins, director of the Company, and Marguerite, an Indian, as his godparents.
On February 20, 1734, Jean Baptiste married Charlotte Marchand at Montreal. They were the parents of:
1. Charles, baptized June 6, 1735
2. Charlotte, married Jacques Lacourse, widower of Jeanne Bienvenu, February 3, 1749.
3. Louis, born February 25, 1744.
4. Elisabeth, married Charles Bienvenu dit Delisle, June 2, 1760 [Régistre de la paroisse]
On May 12, 1724, one-half league on the Grand Prairie stretching from the hills to the Mississippi was granted by the Company to Jean Baptiste Lalande [American State Papers, Public Lands, II, map opposite p. 182]
I have no actual proof, but I strongly suspect that Jacques and Jean Baptiste were brothers. Tanguay [I, 291] gives a Jacques, baptized July 20, 1690, at Montreal as one of the children of Jacques François Lalande and Madeleine Dupont.” Belting, 112-113.