A mother, father and son have lost their lives in what's believed to be a case of carbon monoxide poisoning.
Peel police were called to a Brampton home around 2 a.m. on Monday, where five people were exposed to the gas.
Paramedics transported six people to hospital from the house on 2 Linden Crescent, which is near the 410 Queen Street East.
Three of those people did not have any vital signs and police confirm they are a 59-year old woman, her 60-year old husband and their 36-year old son.
The other two were taken to hospital for observation.
The couple's 29-year old son came home and heard the carbon monoxide detector going off, and discovered his family members.
Police say the family's furnace was not working over the weekend, and they had propane heaters inside the home to keep them warm.