Lori Vallow misses deadline to present missing Idaho children to authorities
Chad Daybell, Lori Vallow

By Lauren Steinbrecher, KSTU

REXBURG, Idaho (KSTU) -- The family of two children missing out of Idaho said they're hoping for quick action by Idaho courts and law enforcement, after the children's mother, Lori Vallow failed to prove that her kids are alive and well.

A court order gave Vallow until 5 p.m. Thursday to bring her daughter, 17-year old Tylee Ryan, and adopted son, 7-year old Joshua JJ Vallow, to either the Rexburg Police Department or the Idaho Department of Health and Welfare in Rexburg.

Vallow was nowhere to be found at either location. The kids were still unaccounted for Thursday evening, according to JJ's biological grandmother Kay Woodcock.

Lori Vallow and her new husband Chad Daybell were served a search warrant by law enforcement last weekend in Kauai, Hawaii.

Police said the kids are not with Chad and Lori.

The Rexburg Police Department and Madison County Prosecutor said Thursday they are not releasing any updates, because the case is sealed.

Meanwhile, an investigation continues into the suspicious death of Chad Daybell's wife, Tammy. Autopsy results in Tammy's death have not yet been released.

There is a $20,000 reward in the disappearance of JJ and Tylee.

MORE: Mother fails to present missing Idaho children, grandmother pleads for answers - KSTU