A 31-year-old man has appeared in court on four charges of murder.
Damien Bendall has been accused of killing a woman and three children.
Mum Terri Harris, 35, and her children John Paul Bennett, 13, and Lacey Bennett, 11, were found dead at the property in Chando Crescent, Killamarsh, near Sheffield.
Also found dead was Lacey’s friend Connie Gent, 11.
Bendall, of Chandos Crescent, appeared at Southern Derbyshire Magistrates’ Court by a video link.
He confirmed his name, address, and date of birth.
He was remanded in custody.