Druin lists both a Joseph Hamelin dit Bellou (b. abt 1770)and a Jean-Baptiste Hamelin (b. July 19, 1766) as marryingUrsule Biroleau (daughter of Ant. and M. Jos. Proulx) at St. Eustache on April 23, 1792. She must have been a popular girl. There is also a Jean-Baptist Hamelin, widower of M. Chs. Biroleau, listed as marrying Marie-Louise Landry (b. 1775) at St. Eustache onFebruary 16, 1797. I'll leave this to you to puzzle out. Certainly brothers marrying sisters were common enough. Marrying the same girl is a bit more unusual. Joseph and Jean-Baptiste were the sons of Jean-Baptiste Hamelin dit Bellou and Marie-Charlotte Matte (1735), married at Cap Sante on October 27, 1761. This Jean-Baptiste was born October 28, 1730, son of Laurant Hamelin (dit Bellou, b. 1692 at Grondines) and Marie-Madeleine Gariepy (1705), who were married February 03, 1722/23, at Ste-Anne de la Perade, Qc. Laurant was the son of Francois (1659-1725), coseigneur of Grandines, and Marie-Madeleine Aubert (1669-1742). Hope this helps.