Mary (Piantes) "Maro" Grillis, 89, of Arlington, Massachusetts passed away on June 9, 2021.  Beloved wife of the late Stephen Grillis. Devoted Mother of Chris Grillis. Loving sister of Leo Piantes and his wife Effie.  Also survived by many relatives and friends.  Funeral Service on Wednesday, June 16, 2021 at the St. Athanasius The Great Church, 4 Appleton Street, Arlington, Massachusetts at 10:30 AM.  Visitation prior to the Service from 9:30AM to 10:30AM at the church. Relatives and friends are kindly invited to attend. In lieu of flowers, donations in her memory may be made to the above named church. Burial in Mt. Pleasant Cemetery, Arlington, Massachusetts.