Amponsah v. Holder, 709 F.3d 1318 (9th Cir. Mar. 22, 2013) (BIA's blanket rule against recognizing state courts' nunc pro tunc adoption decrees constitutes an impermissible construction of the term child in 8 U.S.C. 1101(b)(1)(E), and thus is not due deference under Chevron, U.S.A., Inc. v. Natural Resources Defense Council , Inc., 467 U.S. 837, 843 (1984); the BIAs interpretation is unreasonable because it gives little or no weight to the federal policy of keeping families together, fails to afford deference to valid state court judgments in the area of domestic relations, which is primarily a matter of state concern, and addresses the possibility of immigration fraud through a sweeping blanket rule rather than considering the validity of nunc pro tunc adoption decrees on a case-by-case basis).