Family members are waiting on news of their brother and uncle - they want to know he is OK.

No one has heard from 63-year-old Paul Riddell since he was last seen on March 18 at the downtown group home where he has lived for the last 20 years.

His younger sister, Marie Demeter, isn't sleeping much. She's worried that Riddell might not have a warm place to stay in these cold temperatures and he needs medication every day. She wants him to know his family is waiting for him to come home.

"Paul we love you, we want to get you home, just contact us. We are here for you," she said.

Demeter is the youngest of seven children and has five older brothers. They lost one brother a number of years ago. Riddell is the third in line and a decade older than her.

Riddell was diagnosed with a mental illness about 40 years ago, but Demeter says he is always out and about, making friends and being helpful to others. He's usually out keeping busy during the day.

About 25 years ago, he left town for a couple of days without telling anyone, but this time, he has the family worried.

He left the group home on Robinson Street and didn't come home that night - which isn't unusual, Demeter says. But he always called to tell someone, and this time, he didn't.

The family has reached out through social media, the newspaper and local television to try and find Riddell. They thought there was a sighting recently, but Demeter said it's unclear whether it was him. They haven't heard any other news.

On Saturday afternoon, Hamilton Police had no new leads on his whereabouts.

"All of your nieces and nephews love you dearly and want you to come home. We are worried, maybe he doesn't really understand to what degree," Demeter said.

Riddell is described as a white male, about five-foot-10 and 170 pounds. He has a fair complexion, thinning grey hair and blue eyes.

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He was last seen wearing a brown winter coat, blue winter hat with flaps, black knit sweater, either blue jeans or grey track pants and moccasin-type slippers.

Anyone who has seen Riddell, or has information is asked to call detectives Matt Reed or Fab Giuliani at 905-546-3816 of the Division One Staff Sergeant at 905-546-4725.