It's not clear to me if you have the full death cert for Violet, or only the index information?
In any case, briefly, they were living in Toronto and she died at the age of 29 of TB. She'd only been in her place of residence for 10 days before her death. Buried in St. Catherines Victoria Lawn Cemetery. I'd check to see if Harry Law is also buried there.
Mom Lucy (age 37), Violet and Violet's brother William (age 4) arrived on the Tunisian in Quebec in 1913, headed for Hamilton. [Source: Canadian Passenger Lists, 1865-1935 on Ancestry.com]
The online Voters' Lists at Ancestry might be helpful