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An inquest at Chesterfield Coroner's Court heard the four died as a result of a "violent attack". The coroner's court also heard how a relative of Bendall had phoned police to say the defendant had a self-inflicted stab wound.
In the wake of their deaths, Jason Bennett - the father of Lacey and John Paul - said he had been "devastated" by the loss. He added: "I've been left broken. John and Lacey brought so much love and happiness."
Ms Harris's parents, Angela Smith and Lawrence Harris, described the care worker as "an amazing mum" who "put herself out not just for her family and friends but anyone who needed her help".