Grennen, Mary Margaret on May 3, 2020 in her 94th year. Born in Baraga, Michigan. Beloved wife of the late Joseph. Devoted mother to Mary and (the late Joseph Knipe), Peter and (Maureen), Christopher and (Julianne), Patricia, James and (Marina). Pre deceased by her daughter Jean Whitney and (Floyd). Loving grandmother to Kathleen, Eileen, Patricia, Katherine, Patrick, James, Robert, Richard and Ciara. Adored great grandmother of John, George and Paul. Services Private. Interment St. Charles Cemetery.