By Susie Beever Brianna Ghey’s sister had believed she was upstairs in her room on the night of her murder before receiving the fateful knock on the door from police. The teenager was stabbed to death in Culcheth Linear Park in Warrington, Cheshire, on February 11 last year by evil killers Scarlett Jenkinson and Eddie Ratcliffe. Her murderers, both 16, were jailed and unmasked yesterday after a judge lifted a reporting restriction on their identification due to their ages. Brianna’s family gave gut-wrenching statements to the court on Friday describing the impact the beloved teenager’s murder …