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Citizenship of child on change of citizenship of parent. 
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20.—Where a person who is a citizen of Saorstát Eireann ceases to be a citizen of Saorstát Eireann, such cesser shall not deprive any child of such person who is, at the date of such cesser, under the age of twenty-one years of citizenship of Saorstát Eireann. 
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