The Taoiseach has appointed Sean Haughey to the role of Minister for State at the Department of Education and Science following the resignation of Silé de Valera.
Ms de Valera resigned from her post as junior minister last Friday.
Dublin North Central TD Sean Haughey, the son of former taoiseach Charles J Haughey, was first elected to the Dáil in 1992.
Ms de Valera's resignation at the next general election, following a career of 30 years in politics, will mark the end of the de Valera name in the Dáil.
Her grandfather, Éamon de Valera, was elected to the first Dáil in 1918, and her uncle Vivion de Valera also served. Her cousin, Éamon Ó Cuív, is Minister for Community, Rural and Gaeltacht Affairs.
Ms de Valera, who was elected to the Dublin Mid County constituency in 1977 aged 22, plans to do a PhD in psychology.
