Solis-Espinoza v. Gonzales, __ F.3d __ (9th Cir. March 23, 2005) (blood-relation to U.S. citizen not required to obtain derivative citizenship where child was raised by U.S. citizen "mother," married to biological father, since birth).
http://caselaw.lp.findlaw.com/data2/circs/9th/0370625p.pdf