The family of Rachael Slack and the charity Refuge have called for a public inquiry into "state failings" in response to domestic violence.
Sarah Horley, from Refuge, said the case had shone a light on the failings of Derbyshire Police and added, "Enough is enough. Rachael and Auden's deaths must not be in vain."
A Coroner's report has made recommendations after an inquest found Rachael Slack and her son were unlawfully killed by her former partner.
A timeline of the events surrounding the stabbing of Rachael Slack, Andrew Cairns and their two-year old son, Auden.
The inquest on a mentally ill patient found stabbed to death with his ex-partner and their son in Derbyshire will hear further evidence.