FALLS CITY, Neb. (AP) — A Nebraska mom whose marriage at age 14 generated headlines is trying along with her husband to regain custody of their children.

The 21-year-old Crystal Koso and 29-year-old Matthew Koso were in court last week.

The couple’s three children and one child fathered by another man while Koso was in prison for impregnating Crystal Koso at age 13 have been in state custody since 2010.

The couple drew national attention in 2005 after Crystal Koso became pregnant and they married in Hiawatha, Kan. with her mother’s permission. At the time, such a marriage was allowed with parental consent. The case led Kansas lawmakers to set a minimum marriage age of 15.

Nebraska allows people as young as 17 to marry with parental consent.