Hillis, Mary Ellen (MacMullin), of Arlington, September 26, 2018. Devoted mother of Robert G. Hillis, O.F.S., of Arlington, Dean R. Hillis, his wife Nicole of Burlington, James J. Hillis, and his partner Thomas Lynch, of Arlington, David S. Hillis of Arlington, Catherine Gover and her husband Girard of Wilmington. Loving grandmother of Riley and Jacob Hillis, Nathaniel Hillis, Girard and Jillian Gover. Loving great grandmother of Nolan, Sam and Aaron. Sister of Joan Dixon, her husband Matthew of Bellevue, WA, Jennine Hickey, her husband Timothy and Richard MacMullin and his wife Rosemary, all of Somerville. Further survived by many loving nieces and nephews. A funeral mass will be celebrated at St. Eulalia Church, 50 Ridge St. Winchester, Tuesday, October 2nd at 10 AM. Relatives and friends are respectfully invited to attend. Please go directly to church. Services will conclude with burial at St. Patrick Cemetery, Watertown. In lieu of flowers, memorial contributions in Mary's memory may be made to St. Eulalia Church, 50 Ridge St., Winchester, MA 01890. To leave a message of condolence, please visit www.keefefuneralhome.com.