A child, entitled to child’s insurance benefits on the basis of the wages and self-employment income of an insured individual, who would be entitled, on filing application, to child’s insurance benefits on the basis of the wages and self-employment income of some other insured individual, shall be deemed entitled, subject to the provisions of paragraph (2) of this subsection, to child’s insurance benefits on the basis of the wages and self-employment income of such other individual if an application for child’s insurance benefits on the basis of the wages and self-employment income of such other individual has been filed by any other child who would, on filing application, be entitled to child’s insurance benefits on the basis of the wages and self-employment income of both such insured individuals.