Sanchez, Sheila v. Barnhart, Jo Anne B.

POSNER, Circuit Judge.

This suit challenges the denial of social security disability benefits to the plaintiffs daughter, 12-year-old Chila Sanchez. Although social security disability benefits are designed for disabled workers, low-income parents can obtain them on behalf of their disabled children. 42 U.S.C. § 1382c(a)(3)(C). The standard rationale for this curious-seeming extension of the benefits program for disabled adults is, as we explained in Keys v. Barnhart, 347 F.3d 990, 991 (7th Cir.2003), that having a disabled child may limit the amount of productive work that the parents can do,…