The Historic Burying Grounds Initiative is a program within the Boston Parks and Recreation Dept. They seek to preserve, restore and record the history of Boston's 16 historic burying grounds. The website is at http://www.cityofboston.gov/parks/hbgi/search.asp There are 2 Sissons listed, as per their database: Bert Sisson, 1832/7/?, buried Bunker Hill Burying Ground, location BH/B41 Mary C. Sisson, 18/7/13, buried Bunker Hill Burying Ground, location BH/B41. Cathy