Several hundred people are taking part in a prayer vigil outside the home of Riley Mercer, 15 in Conception Bay South. 

They came by bus, car and foot to the suburban neighbourhood, and carried small lights and candles. 

Bundled up in warm clothes, they clutched cups of hot chocolate provided by the Salvation Army and sang hymns.

Riley Mercer

Riley Mercer died five months ago from a rare form of brain cancer. (Courtesy Louise Mercer)

Mercer, 15, was diagnosed with a rare form of brain cancer in December 2011. When Mercer was a toddler, his older sister, Alex died of the same disease at the age of nine. 

In recent months, Mercer's condition has worsened. He has lost his sight and hearing and is now confined to bed. 

Last month, Villa Nova Junior High School in C.B.S. raised more than $14,000 to help support his family while his parents stay by his side. 

Parents feeling the strain

Mercer's illness has taken a toll on his parents, Louise and Bernard, who are caring for their second child with cancer. 

They said their son needs them so much, the only way they could attend was if the gathering was held outside their house. 

Alex Mercer

Alex Mercer, Riley's older sister, died of the same rare cancer when she was nine years old. (Courtesy Louise Mercer)

Louise Mercer has planned to speak at the vigil, about how Riley's illness and Alex's death have affected her family. 

"She really feels like she needs [this] now," said Carla Crotty, a friend of the Mercer family. 

The vigil has been organized by the Long Pond Salvation Army, two local schools, and friends of the Mercer family. The RNC has been providing traffic enforcement services in the area.