 Family and friends said goodbye. Their final goodbye is Friday to a mother and her young child in Larchmont. Molly Murphy Donovan of Mamaroneck and her six-year-old son, Michael Volpe, were killed a week ago Thursday when they were struck by a school bus. Mother and son were walking to school when the bus hit them on Mamaroneck Avenue. Police say they were in the crosswalk and had a walk signal when they were struck.