Mrs. Maybelle S. McGrath, 69 years old, 4520 Thornleigh Drive, wodow of Maurice F. McGrath, a former president of Indiana Limestone Company at Bedford, died yesterday at her home. Born at Brazil, she had lived in Indianapolis for 35 years.She was a member of St. Matthew's Catholic Church. Funeral services will be held at 9a.m. Friday in St. Matthew's Church, with burial in Calvary Cemetery, Friends may call after 6 pm today at Kirby Mortuary. Survivors include a son, Maurice F. McGrath, Jr. of Indianapolis; four sisters, Mrs. J. Lewis Slattery, Mrs. John F. McCathy, and Miss Mary L. Seery, all of Indianapolis and Mrs. Calvin S. Roberts of Bryn Mawr, Pa; two brothers, Joseph W. Seery, and Justin C. Seery, both of Indianapolis, and two grandchildren.