When Alonzo Simeon Lavallette was born on 25 July 1869, in Shelburne, Chittenden, Vermont, United States, his father, Charles Daumay dit Laviolette, was 43 and his mother, Rose Lavallée, was 34. He married Josephine Frances Robidoux on 30 March 1894, in Shelburne, Chittenden, Vermont, United States. They were the parents of at least 5 sons and 5 daughters. He lived in Charlotte, Chittenden, Vermont, United States in 1910 and Cornwall, Litchfield, Connecticut, United States in 1954. He died on 19 August 1954, in New Milford, Litchfield, Connecticut, United States, at the age of 85, and was buried in Shelburne, Franklin, Massachusetts, United States.