As a condition of granting or continuing pension under section 1521, 1541, or 1542 of this title, the Secretary—

(1) may require from any person who is an applicant for or a recipient of pension such information, proofs, and evidence as the Secretary determines to be necessary in order to determine the annual income and the value of the corpus of the estate of such person, and of any spouse or child for whom the person is receiving or is to receive increased pension (such a child is hereinafter in this subsection referred to as a “dependent child”), and, in the case of a child applying for or in receipt of pension under section 1542 of this title (hereinafter in this subsection referred to as a “surviving child”), of any person with whom such child is residing who is legally responsible for such child’s support;

(2) may require that any such applicant or recipient file for a calendar year with the Department (on such form as may be prescribed for such purpose by the Secretary) a report showing—

(A) the annual income which such applicant or recipient (and any such spouse or dependent child) received during the preceding year, the corpus of the estate of such applicant or recipient (and of any such spouse or dependent child) at the end of such year, and in the case of a surviving child, the income and corpus of the estate of any person with whom such child is residing who is legally responsible for such child’s support;

(B) such applicant’s or recipient’s estimate for the then current year of the annual income such applicant or recipient (and any such spouse or dependent child) expects to receive and of any expected increase in the value of the corpus of the estate of such applicant or recipient (and for any such spouse or dependent child); and

(C) in the case of a surviving child, an estimate for the then current year of the annual income of any person with whom such child is residing who is legally responsible for such child’s support and of any expected increase in the value of the corpus of the estate of such person;

(3) shall require that any such applicant or recipient promptly notify the Secretary whenever there is a material change in the annual income of such applicant or recipient (or of any such spouse or dependent child) or a material change in the value of the corpus of the estate of such applicant or recipient (or of any such spouse or dependent child), and in the case of a surviving child, a material change in the annual income or value of the corpus of the estate of any person with whom such child is residing who is legally responsible for such child’s support; and

(4) shall require that any such applicant or recipient applying for or in receipt of increased pension on account of a person who is a spouse or child of such applicant or recipient promptly notify the Secretary if such person ceases to meet the applicable definition of spouse or child.