Trudy Holder is haunted by her parents' suspicious disappearance on their way from Alberta to B.C.

"We were supposed to be at Cultus Lake playing in the swimming pool and playing in the lake with Nanny and Grandpa," she told CTV News.

Seventy-eight-year-old Lyle McCann and his 77-year-old wife Marie haven't been seen since July 3 when they left St. Albert, Alta., in their motorhome bound for B.C.

They were supposed to pick Trudy and Morgan up at the Abbotsford Airport a week later.

"We landed and started looking out the plane window, ‘Is that Nanny in the window there? Is that Grandpa in the window there? (We) went into the terminal; they weren't there," Trudy said.

Alarmed, Trudy called RCMP and learned her parents' motor home had been found abandoned five days earlier on a remote road near Edson, Alta. The SUV they were towing behind it is still missing.

"My mom and dad are just traditional, conservative, lovely people, and that's just out of our realm of possibilities that I would get that kind of information," Trudy said.

Today police called off the search of the woods where the motorhome was found, and began canvassing businesses near a St. Albert, Alta., gas station where the couple was last seen on surveillance video the day they left home.

"Maybe my mom went into the store and my dad was putting the gas in, or something like that, and someone got into the motorhome. I can't see them stopping along the road unless there was someone desperately needing help."

With a report from CTV British Columbia's Shannon Paterson