PETERSON, Elena Julia Of Lexington, Sept. 17, 2012. Wife of the late Frederick J. Peterson. Mother of David A. Peterson and his wife Nancy of Acton, and the late Richard Peterson and his surviving wife Carole of Medford. Sister of Robert Principato of Hampton, NH. Elena is also survived by 2 grandchildren, Shannon L. Wyman and Nicholas D. Peterson. A Mass of Christian burial will be celebrated Thursday Sept. 20 at St. Brigid Church, 2001 Mass Ave. Lexington at 10am. Relatives and friends are kindly invited to attend. In lieu of flowers, donations in her memory may be made to Youville Place, 10 Pelham Rd. Lexington, MA 02421. Interment Westview Cemetery, Lexington.