Sinn Féin for nine years. (It merged with two other organisations to form Fine Gael in 1933.) Anti-Treaty Sinn Féin members continued to boycott the Dáil. At a special "Ard Fheis" in March 1926, de Valera proposed that elected members be allowed to take their seats in the Dáil if and when the controversial Oath of Allegiance was removed. When his motion was defeated, de Valera resigned from Sinn Féin; on 16 May 1926, he founded his own party, Fianna Fáil, which was dedicated to republicanising the Free State from within its political structures. He took most Sinn Féin TDs with him.
Éamon de Valera and two daughters: Máirín (1912–84) and Emer (1918–2012). Brian de Valera predeceased his parents. While he was already involved in the Gaelic Revival, de Valera's involvement in the political revolution began on 25 November 1913, when he joined the Irish Volunteers. The organisation was formed to oppose the Ulster Volunteers and ensure the enactment of the Irish Parliamentary Party's Third Home Rule Act won by its leader John Redmond. After the outbreak of World War I in August 1914, de Valera rose through the ranks and it was not long before he was elected captain of the Donnybrook branch. Preparations