John M Grennon age: 80 Related to:Maryellen Silverio, 55 Has lived in:Londonderry, NH Everett, MA Quincy, MA Halifax, MA John W Grennon age: 79 Known as: John J Copland Related to:John Grennon, 108 Paul Grennon, 78 Has lived in:Milwaukee, WI Dennis Port, MA Brighton, MA South Hadley, MA