John Patrick Treacy, 83, of Sudbury, passed away Sunday, October 28, 2018, after an illness. He is survived by his wife Therese “Terri” Margaret (Kinnaly); three children, Anne Lee and her husband Patrick, Kevin Treacy and his wife Jennifer, Stephen Treacy and his wife Jennifer; Eight grandchildren, Briana, Katie, and Conor Lee, Brendan and Matthew Treacy, and Caitlin, Braden, and Devyn Treacy; Three siblings, James Treacy, Winifred McDonough, and Maryanna McCarthy. He was predeceased by his parents, William J. and Margaret (Barrett) Treacy, and siblings William Treacy, Margaret Sacco, and Thomas Treacy. A Mass of Christian Burial will be held Friday, November 2 at 11:00AM at Our Lady of Fatima Parish, 160 Concord Road, Sudbury. Interment will follow at New North Cemetery in Sudbury. Visitation will be held Thursday, November 1 from 4-8PM, at the Duckett-J.S. Waterman & Sons Home of Memorial Tribute, 656 Boston Post Road, Sudbury. In lieu of flowers, the family suggests memorial contributions to Massachusetts General Hospital Cancer Center, c/o Development Office, 125 Nashua St, Suite 540, Boston, MA 02114 or online at giving.massgeneral.org