Plunkett

I am looking for information on a Family by the Name of Plunkett who are listed on the Canadian Census of 1881 that lived in Perth, Ontario at the time. The Fathers name was Robert Plunkett born Approx.1820 and the Mother was Mary Plunkett born approx. 1846. There were 6 children, Eliza, Martha, Robert James, William Thomas, Mary Ann, Sara, John Henry, David Eli. Any information would be greatly appreciated.