Joyce, Mary J. (Sibert) of Cambridge Sept. 16th. Devoted mother of John Voltolini, Donna of Virginia, Edward "Skip" of Alabama, Rose of California and Tracey Joyce. Loving mother in law of Donna Voltolini and Dawn Joyce. Beloved sister of Irene Duprey, Jane Marquardo, John and Arthur "Buddy" Sibert and the late Rita Bernier, Bernadine, Leonard and Joseph Sibert. Also survived by 14 Grandchildren, 2 Great Grandchildren, many Nieces and Nephews. Funeral Service at the Rogers Funeral Home, 380 Cambridge St., Cambridge, Monday at 11 am. Visiting Hours Sunday 2 to 6 pm. In lieu of flowers donations in her memory may be made to the Somerville/Cambridge Elder Service, 61 Medford St., Somerville, MA 02143 or to Compassionate Care Hospice, 800 West Cummins Park, Woburn, MA 01801.