An Amber Alert remained in effect across Alberta on Canada Day as police continue to search for leads in the perplexing disappearance of a five-year-old boy and his grandparents.
Nathan O'Brien was reported missing Monday morning when his mother went to pick him up after a sleepover at the grandparents' southwest Calgary home and they weren't there.
Police say based on things they found in the home, they don't believe the residents left voluntarily.
Investigators now confirm the family held an estate sale in the home over the weekend, but they say it's too early to determine whether it's relevant to the case.
Investigators have said that the grandparents, 66-year-old Alvin Cecil Liknes and Kathryn Faye Liknes, 53, are not suspects.
"Obviously we want to find them as soon as possible," Insp.Keith Cain said Tuesday about the missing trio.
Nathan O'Brien is described as three feet tall, curly blonde hair and was last seen wearing peach-coloured shorts and a blue-striped hoodie.
Alvin Liknes is six feet tall, 200 pounds with grey and blond hair and was wearing black shorts. Alvin has a distinctive walk. Kathryn Liknes is five-foot-three-inches tall, 120 pounds with reddish-brown hair and green eyes.