An applicant who is the son or daughter of a fully or currently insured individual, but who is not (and is not deemed to be) the child of such insured individual under paragraph (2) of this subsection, shall nevertheless be deemed to be the child of such insured individual if:

(A) in the case of an insured individual entitled to old-age insurance benefits (who was not, in the month preceding such entitlement, entitled to disability insurance benefits)— (i) such insured individual— (I) has acknowledged in writing that the applicant is his or her son or daughter, (II) has been decreed by a court to be the mother or father of the applicant, or (III) has been ordered by a court to contribute to the support of the applicant because the applicant is his or her son or daughter, and such acknowledgment, court decree, or court order was made not less than one year before such insured individual became entitled to old-age insurance benefits or attained retirement age (as defined in subsection ( l )), whichever is earlier; or (ii) such insured individual is shown by evidence satisfactory to the Commissioner of Social Security to be the mother or father of the applicant and was living with or contributing to the support of the applicant at the time such applicant’s application for benefits was filed;

(B) in the case of an insured individual entitled to disability insurance benefits, or who was entitled to such benefits in the month preceding the first month for which he or she was entitled to old-age insurance benefits— (i) such insured individual— (I) has acknowledged in writing that the applicant is his or her son or daughter, (II) has been decreed by a court to be the mother or father of the applicant, or (III) has been ordered by a court to contribute to the support of the applicant because the applicant is his or her son or daughter, and such acknowledgment, court decree, or court order was made before such insured individual’s most recent period of disability began; or (ii) such insured individual is shown by evidence satisfactory to the Commissioner of Social Security to be the mother or father of the applicant and was living with or contributing to the support of that applicant at the time such applicant’s application for benefits was filed;

(C) in the case of a deceased individual— (i) such insured individual— (I) had acknowledged in writing that the applicant is his or her son or daughter, (II) had been decreed by a court to be the mother or father of the applicant, or (III) had been ordered by a court to contribute to the support of the applicant because the applicant was his or her son or daughter, and such acknowledgment, court decree, or court order was made before the death of such insured individual, or (ii) such insured individual is shown by evidence satisfactory to the Commissioner of Social Security to have been the mother or father of the applicant, and such insured individual was living with or contributing to the support of the applicant at the time such insured individual died.

For purposes of subparagraphs (A)(i) and (B)(i), an acknowledgement, court decree, or court order shall be deemed to have occurred on the first day of the month in which it actually occurred.