Mike Mustybrook of 678 McMahon Ave.;Monessen died Thursday;June 25;1981;at 2:10 a.m.in Jefferson Center;South Hills Health System. He was 71. Mr.Mustybrook was born Oct.1;1909 in Arnold City;and was a resident of Monessen for over 40 years. He retired in 1957 from the Monessen Plant of Wheeling Pittsburgh Steel Corp and was a member of St.Cajetan R.C.Church;Monessen. Survivors include his widow;Grace Kyle Mustybrook;one son;George Mustybrook of Rockford;Ill.;four daughters;Mrs.Martin (Betty Mae) Kronander of Orange;Va.;Mrs.Joseph (Mary Gene) Bridge of Belle Vernon;Mrs.Robert (Billie Ann) Gilmore of W.Fairview;Pa.;and Mrs.Michael (Denise) Mahalic of Milroy;Pa.;hree sisters;Mrs.Mary Krupella of Belle Vernon;Mrs.Elizabeth Ferik of Cleveland;Ohio;and Mrs.Margaret Cirka of Ambridge;19 grandchildren and one great-grandchild. Friends will be received from 7 to 9 p.m.Thursday and 2 to 4 and 7 to 9 p.m.Friday in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon. A Mass of Christian Burial will be held Saturday at 9:30 a.m.in St.Cajetan R.C.Church;Monessen;with the Rev.P.Lino Ramellini;pastor;as celebrant. Interment will be in Belle Vernon Cemetery. A Prayer service will be conducted in the funeral home Friday at 8 p.m. The Shelby D.Ferguson Funeral Home is in charge of arrangements.