They have been identified as Joseph and Elizabeth Perrin with four of their children - Charles, Albert, Millie, and Celia. The older couple may be Joseph's parents, William and Mary Ann Perrin. The young man is unidentified but may be a hired hand.
2013.052.001 - Print, Photographic. (2018). Waterloo.pastperfectonline.com. Retrieved 14 May 2018, from https://waterloo.pastperfectonline.com/photo/32B31B47-2492-4256-A7F0-653668006510