It seems the man in question obtained Irish citizenship by registration in the foreign births register on 16 July 2001. The woman to whom the Deputy refers recently became an Irish citizen on foot of making a declaration of post-nuptial citizenship. Since all three children were born before the couple became Irish citizens, they cannot obtain Irish citizenship automatically through their parents.
However, it is open to the woman in question to apply for naturalisation on behalf of all three children, or the man in respect of the two youngest children and the woman in respect of the oldest child, and I have asked officials in the citizenship section of my Department to send the appropriate forms to her. The average processing time for applications for naturalisation is approximately 24 months but it is usually possible to finalise applications on behalf of minors more quickly. In the meantime, the couple's eldest child, who is 16 years, should register immediately with the Garda national immigration bureau.