In general

The term “qualifying child” means, with respect to any taxpayer for any taxable year, an individual—

(A) who bears a relationship to the taxpayer described in paragraph (2),

(B) who has the same principal place of abode as the taxpayer for more than one-half of such taxable year,

(C) who meets the age requirements of paragraph (3),

(D) who has not provided over one-half of such individual’s own support for the calendar year in which the taxable year of the taxpayer begins, and

(E) who has not filed a joint return (other than only for a claim of refund) with the individual’s spouse under section 6013 for the taxable year beginning in the calendar year in which the taxable year of the taxpayer begins.