O'Sullivan of South Boston, formerly of Ireland, April 8, 2012, Daniel P. O'Sullivan, age 55. Beloved son of the late Patrick and Margaret (Cronin) O'Sullivan. Loving brother of Patrick O'Sullivan of Dover, Margaret Hanratty of Cork, Ireland, Dianne O'Sullivan of Newton, and Breda O'Sullivan of Cohasset. Nephew of Elizabeth Bryan of Wakefield and her husband the late Edward. Also survived by nieces, nephews, and cousins. Funeral from the John C. Burns and Sons Funeral Home, 305 Broadway, Cambridge, Thursday, May 10, at 9:00 a.m. followed by a funeral mass in St. Mary's Church, Cambridge, at 10:00 a.m. Relatives and friends invited. Visiting 1 hour prior to mass, from 9-10 a.m. Interment, Cambridge Cemetery.