A man is due to appear in court charged with the murders of Tracey Wilkinson and her son Pierce, 13, and the attempted murder of the boy's father Peter.
Aaron Barley, 23, of no fixed abode, was charged on Friday afternoon, West Midlands Police said.
The Wilkinson family were stabbed in a "horrifying" attack at their home in Stourbridge, West Midlands, at around 8am on Thursday morning.
Tracey Wilkinson, 50, was pronounced dead at the scene while her son was pronounced dead after being taken to hospital. Peter Wilkinson, 47, is in a critical but stable condition in hospital after suffering serious stab injuries.
Barley is due to appear before Birmingham magistrates on Saturday.
Pierce's school today paid tribute to the "kind and thoughtful young man."