The fire broke out in a house on Conestoga Drive shortly before 2 a.m. Monday.
It was so fierce that the firefighters had to retreat at first before attempting to rescue those inside.
They pulled four people but all four succumbed to their injuries at the hospital.  A fifth person was found dead inside.
Family posts on social media and crowdfunding sites identified the parents as Nazir Ali and Raven Ali O’Dea and their three children as Alia, 10, Jayden, 8, and Layla, 7.
The children’s grandmother from the mother also suffered severe burns and remains in hospital.  Two occupants who lived in the basement of the house managed to escape without being injured.
The children attended a school in the Peel District School Council.
“Counselors and other support staff from the school board’s Crisis Response Team are available to assist students and staff in this difficult time,” PDSB spokeswoman Malon Edwards told CP24.  “The council has also supported the families of the school communities.”
In the charred ruins of the house on Tuesday, firefighters with uniforms were seen coming in and out of the construction.
Ontario Deputy Fire Chief Tim Beckett said they would be at the scene for some time.
“We have a large team that will come together and our task today is to really start assembling the pieces of what caused yesterday’s tragic fire.”
He said they had not yet reached a point to announce findings, but asked everyone in the province to check the condition of their smoke detectors.
“Please grandparents now, go and check and make sure your grandchildren are safe in their homes.  “The house is supposed to be the safest place and unfortunately five people lost their lives in a place that was supposed to be safer.”
The children’s grandfather from the mother told CTV News Toronto on Monday that he did not believe the house had functional smoke alarms.
Police kept Conestoga Drive closed again on Tuesday to allow investigators to maneuver.

title: “Investigators Piecing Together Cause Of Brampton Ont. Fire That Killed Family Of Five " ShowToc: true date: “2022-10-29” author: “Elizabeth King”

The fire broke out in a house on Conestoga Drive shortly before 2 a.m. Monday.
It was so fierce that the firefighters had to retreat at first before attempting to rescue those inside.
They pulled four people but all four succumbed to their injuries at the hospital.  A fifth person was found dead inside.
Family posts on social media and crowdfunding sites identified the parents as Nazir Ali and Raven Ali O’Dea and their three children as Alia, 10, Jayden, 8, and Layla, 7.
The children’s grandmother from the mother also suffered severe burns and remains in hospital in critical condition.  Two occupants who lived in the basement of the house managed to escape without being injured.
At this point the cause of the fire remains unclear, however the children’s grandfather told CTV News Toronto on Monday that he believes the house did not have functional smoke detectors.
Speaking to reporters at the scene on Tuesday, Ontario Fire Chief John Peg said that while investigators were still trying to determine if this was actually the case, the absence of working smoke detectors could provide an explanation for the tragic result.
“The fire is spreading so fast in our homes these days with the construction we have and the plastics there, so the smoke is so dense and black (as a result),” he said.  “If you do not have a smoke alarm that works, unfortunately we will see more tragedies like over my shoulder.  We need to get serious.  “We have to be serious about smoke alarms.”
In the charred ruins of the house on Tuesday, firefighters with uniforms were seen coming in and out of the construction.
Pegg said investigators are likely to remain on the scene for at least another day as they continue to work to determine the cause and origin of the fire.
Meanwhile, he said he wants to remind residents of the importance of ensuring they have functional smoke detectors.
He said that in addition to what is required by law, “a simple smoke alarm with a battery that can cost you $ 10 to $ 15 can save your life and the lives of your family.”
“Hypothetically, I can say that if you had a fire that started in an area of ​​your house, it burns so fast and so dark, if this smoke alarm goes off even if you are on the other side of the house, you will hear this alarm and you have the opportunity to go out, “he said.  “But on the other hand, if you do not have functional smoke alarms, the fire will spread throughout the house and will probably block your exit and you will be in a situation where you are in dense, unbelievable smoke and you can not see.  It really makes a difference. “
Grief counselors were provided by Peel School Board
The three children who lost their lives in the fire all went to school at the Peel District School Board.
The board has not said which school the children attended, but has indicated that grief counselors and other support staff from the Crisis Management Team will be available to assist students and staff as long as they need it.
Meanwhile, Brampton Fire Chief Bill Boyes told reporters Tuesday that firefighters at the scene on Monday were “devastated” and “mourning” along with the entire city.
The children’s aunt also took a moment to remember her nieces and nephew during Tuesday’s press conference, telling reporters that they were the kind of children “who really loved what they were and not what they had”.
“I think they are a really beautiful quality and I just can not believe I will never see them again,” said Bisma Ali.
Police kept Conestoga Drive closed again on Tuesday to allow investigators to maneuver.