BOSTON — The Department of Children and Families failed to protect a 7-year-old boy who police say was beaten and starved by his father and who is now in a coma, according to a report released Friday. The investigation, carried out by DCF’s special case investigation unit, found that the department failed to pull together multiple abuse reports – an oversight that ultimately led to the failure to adequately safeguard Jack Loiselle. The report said the department did some things right, including carrying out appropriate visits, filing required reports and delivering extensive services to the parent and child. But Republican Gov.