Patrick Kennedy (left), son of the late Senator Ted Kennedy, and Patrick Grennan, fourth cousin of President John F Kennedy,his wife Siobhan and children Eanna and Donagh, at the Kennedy Homestead and Visitor Centre, Dunganstown, New Ross, Co Wexford. Photograph: Eric Luke

Early one Sunday morning last month, Patrick Kennedy, son of the late Ted Kennedy and himself a former US congressman, travelled straight from Dublin (...)