Ethan John, 11, and his sister Elizabeth, seven, were found with significant injuries, said police.
Two children who were killed inside a house in Stoke-on-Trent have been named.
The children's schools paid tribute to their pupils, saying Ethan had an "infectious smile" and Elizabeth was a "ray of sunshine"."Ethan was a wonderful member of our school community. He had impeccable manners and an infectious smile," a statement said.Elizabeth's school said she was "a kind, caring and friendly member of our school family".
Det Ch Insp Cheryl Hannan said: "We are solely focussed on finding out what happened to these two children and supporting those affected by this deeply traumatic incident.
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