The brother of a disabled B.C. girl who spent nine days at her dead mother's side before being found, said his sister tried to nurse their dead mother back to health.

The teen girl, who has Down syndrome, was found last month in the trailer she shared with her mother. Her mother was dead and the girl was emaciated and alone in the filthy trailer.

Mike Prentice said the girl, who is his half-sister, had been trying to give medicine to their mother in an attempt to revive her.

He told CTV's Canada AM it is an "emotionally charged" situation.

"Especially when I think about my sister being with my mom's body that was decomposing for about nine days, my sister with Down syndrome," Prentice said.

"She was trying to nurse my mother back to health with pills and stuff, also there's an open macaroni box with cheese sprinkled on it so you know she was trying to make my mom better while she's lying there dead on the floor."

It wasn't until a neighbour noticed that the trailer seemed strangely silent that police were called to the shocking scene.

Prentice said his sister is now staying at a group home for people with special needs in Chilliwack, B.C. and is doing well.

He said his mother was addicted to prescription medication and struggled with alcoholism, and had isolated herself from the rest of the family, refusing to allow him to visit.

Prentice lives in North Vancouver, about 100 kilometres away from Chilliwack, where his mom and sister lived.

He said his mother's phone was cut off and no one was able to get in contact with her. As a result, no one knew she had died and that his sister was all alone.

"I felt in my heart I knew something was seriously wrong. I do not have a vehicle but I was trying to get out to Chilliwack and I just couldn't make it," Prentice said.

"She didn't have a phone because her addiction problems got so bad near the end. Her phone went out of service a couple of months before that so there was no way."

It's believed that the mother overdosed in the trailer.

CTV's Rob Brown reported Thursday that B.C.'s Ministry of Children and Family Development is officially probing the case, but he said officials wouldn't speak on the specifics due to privacy concerns.

Though the 14-year-old girl was safely taken into provincial custody after the discovery was made on Sept. 14, Prentice says that very little was done to prevent the incident.

He said his mother had lost about 100 pounds in the last two years and weighed about 85 pounds when she died.

"It's traumatic, it's horrible. I get pictures of what my mom looked like, rotting away," said Prentice.

He added that his mother's addiction to prescription drugs and alcohol had been getting worse. However, authorities wouldn't remove the girl from the home.

"I don't know how this slipped through the cracks because all you had to do is take one look at my mom and you knew that something very serious was wrong," Prentice said.

Last summer Prentice's brother removed their sister from the home over safety concerns, but was later told by provincial officials that the teen would have to go back home or he would face possible kidnapping charges.