If you are searching for Joseph Begin and Aurelie Paquet, I have this for you. In our "Dictionnaire généalogique des Bégin du Québec et d'Amérique", Joseph Begin married to Aurelie Paquet, August 23, 1864 in S. Julie Plessisville (Quebec). Parents of Joseph Begin are Charles Begin and Rosalie Samson. We also have retrieved three of the children of Joseph Begin and Aurelie Paquet: Louis-Olivier (Angeline Gagné), Joseph (Eugenie Delongchamps) and Clara (David Deschamps).
Then, your Léa or Louise Begin would be also another child of Joseph and Aurelie. Is this correct? Do you have other things?