Prashant Tiwari committed suicide last summer at Brampton Civic Hospital while under treatment, the lawsuit alleges, adding he had been admitted to the psychiatric ward after he had started cutting himself.
Rakesh Tiwari alleges his son was left unattended in a hospital bathroom for three hours. During that time, the 20-year-old used his hospital gown and a chair to hang himself, his father said.
"He volunteered himself to the hospital. He knew he had some problem, and he was fighting and he needed help," said Rakesh Tiwari.
"He was not to die."
Tiwari believes staff were supposed to check on his son every 15 minutes.
"My son should not have been unattended," he said.
Hospital expresses condolences
Rakesh Tiwari also said that during the 10 days his son was in hospital, staff didn’t tell him the type of medications Prashant was on, or his diagnosis.
William Osler Health System, the organization that runs the hospital, issued a written statement that said: "While we do not comment on an individual patient case, we have and continue to express our sincere condolences for the family's loss."
None of the allegations has been proven in court.
The Tiwari family say it hopes the lawsuit will prompt all hospitals to review their procedures around potentially suicidal patients.
The family was set to hold a news conference in Toronto on Wednesday to continue the call for better treatment for high-risk patients.