The bodies of 57-year-old Manjulaben Mistry, 61-year-old Hashmukhlal Mistry and an unidentified 91-year-old man were found on Sunday morning.
Police are calling it a possible murder-suicide.
Officers had initially been called to the scene by a family member regarding the well-being of a relative.
That relative was among the three found dead inside the home.
Investigators spent yesterday on the scene trying to piece together what happened.
Police say all three lived at the residence. Neighbours expressed shock, describing the residents as "quiet" and "nice."
'Mind boggling' situation, neighbour says
Mohammed Hamid, a neighbour on the street, told CBC Newsthat Manjulaben and Hashmukhlal Mistry were a couple and have lived in the home for more than 20 years.
Hamid said the woman living at the house worked as a teller at a nearby Scotiabank, and that the couple have two adult daughters who have since moved away and have children of their own.
Hashmukhlal would show him his grandchild, said Hamid, of whom he was very proud.
Neighbours say Hashmukhlal was an engineer who had been laid off within the last two years. He was known in the neighbourhood for taking pride in his lawn.
"This is mind boggling," said neighbour Bibi Hamid. "You never hear any noises coming from their house. They were basically just quiet people."
"I cannot believe that happened to that family. They were a really nice family," said neighbour Matt Mehrdad.