After settling down in Washington DC following the war, Martin and his wife Bridgett Harlow (also from Roscommon, Ireland) had a son Martin Jr, Martin Thomas Conboy Jr. a devout Irish Catholic who grew to become an important advocate and ally to Irish Republicans in there struggle independence, becoming an increasingly powerful and well established attorney in United States politics in the process. Martin’s access to power in the US led him to become a influential Irish Americans working behind the scenes, legally and politically, to secure US support for the establishment of the Republic of Ireland. As friend of, and legal council inside the US to Irish Republican leader Éamon de Valera who went on to become the inaugural Taoiseach of the Republic of Ireland (first of his record 3 non-consecutive terms). Following the 1916 Easter Rising Conboy utilized his friendship with Franklin D. Roosevelt (during FDR’s time as N.Y. state governor) to rally US political and monetary support to aid Irish Republicans in the 1921 War of Independence from the British Crown. Roosevelt would go on to appoint Martin Jr to the powerful post of United States Attorney for the Southern District of New York.