Minasyan v. Gonzales, __ F.3d __ (9th Cir. March 22, 2005) (derivative citizenship shown through naturalization of mother only, based upon 2001 nunc pro tunc court order dissolving marriage and showing that parents were separated and mother was in sole custody since 1993).
http://caselaw.lp.findlaw.com/data2/circs/9th/0273556p.pdf