"We pray they find something to help us gain closure," Mark McOmie wrote on Facebook. "We remain hopeful. We would like to thank the National Park Service for their diligent search efforts."
As the search for a woman and her stepgrandson who vanished at the bottom of the Grand Canyon grows increasingly desperate, the last known photos of the duo have emerged.
LouAnn Merrell, 62, and her stepgrandson, Jackson Standefer, 14, have been missing in the Arizona park since April 15.
While search teams have yet to find the pair, they did find Standefer's backpack, which had a GoPro mounted on it. The camera carried the last photos of the woman and the teen.