Robert Milwrick left California Tuesday with his sister. Robert Milwrick left California Tuesday with his sister. RCMP

Police in Burnaby, B.C., are trying to find out what's happened to a missing elderly American man who was driving with his sister from California to Alaska.

The man's 85-year-old sister turned up confused and disoriented on a stranger's doorstep in Burnaby on Friday.

But there's no sign of her 80-year-old brother, Robert Milwrick.

The pair were headed to Alaska on vacation and left suburban Los Angeles on Tuesday in Milwrick's 1994 Blue GMC Suburban SUV. They entered Canada on Thursday.

RCMP were called by a Burnaby homeowner whose front door the elderly woman had knocked on at about 9 a.m. PT Friday in a confused state, said Cpl. Brenda Gresiuk.

Gresiuk said the woman — whose name is not being released — is suffering from a medical condition and investigators had to go through her purse to piece together where she is from.

Family notified

Family members in the U.S. have been contacted and are on their way to help care for her.

Gresiuk is asking for the public's help to find Milwrick.

"You have some elderly family members travelling together and one's fallen ill and we don't know where her travelling companion, her brother, is and we're hoping that he's out there safe and he just doesn't know what to do."

Milrick was driving a silver and blue SUV with Arizona license plate APF 5845.

The car was towing a U-Haul trailer with the North Carolina license plate AA 32508.

Robert Milwrick is white and approximately 5’7" and 155 lbs. He is balding, wears glasses, and was last seen wearing blue jeans.

Anyone with information is asked to call Burnaby RCMP.

With files from the CBC's Meera Bains