An Amber Alert remains in effect for two children missing from their Idaho home. Authorities plan to drain small ponds in the area as they continue to search for any clues about eight-year-old Shasta Groene and her nine-year-old brother Dylan. Sheriff's Captain Ben Wolfinger says they're looking for -- quote -- "evidence of any sort, or, God forbid, the children." Police say they have interviewed a man who was at the family's home Sunday night, hours before the bodies of three people were found -- including the body of the children's mother. Vance Groene, an older brother of the missing children, tells NBC he is certain Robert Lutner had nothing to do with the crime. He says he doesn't know who would hurt his family.