3Where the parents, or either of them, fail to furnish the necessary information within the time limited for the purpose, the Registrar-General may at any time after the expiration of that time require the parents of a person whom he believes to have been legitimated by virtue of this Act, or either of them, to give him such information concerning the matter as he may consider necessary, verified in such manner as he may direct, and for that purpose to attend personally either at a registrar's office or at any other place appointed, by him within such time, not being less than seven days after the receipt of the notice, as may be specified in the notice.