Donna M. Duffy (née Brennan), age 81, late of Cedar Lake. Beloved wife of John F. Duffy Sr.; Devoted mother of Mary Pat Corder, Madonna (Kevin) Dwyer, John (Kim) Duffy, and the late Maureen (Ed) Grice; Proud grandmother of Kelly, Renee, Kevin, Thomas, Angela, Sherri, Sean, and the late David and Eddie; Loving great-grandmother of 15; Dear sister of Mary Rita (late Robert) Elke, the late Thomas (late Olga), Jack (late Mary), Joe (late Mary), Jerry (late Charlotte), Patrick (late Rosaria), and Helen (late Walter) Walsh; Kind aunt of many nieces and nephews. Visitation Thursday from 9:00 a.m. until the time of Funeral Mass at 11:30 a.m. at Holy Name Catholic Church, 11000 W.133rd Ave., Cedar Lake, IN 46303. Interment Assumption Cemetery, Glenwood, Illinois.