The devastated parents of a Hartlepool teenager who lost her courageous battle with leukaemia have described her as "a gift to the world ." Grace Measor passed away on Friday as a result of complications following a stem cell transplant . The kind-hearted 19 year old had penned letters to her loved ones to be opened upon her death, encouraging them to embrace life to the fullest and reassuring them "it's okay". The letters are bringing enormous comfort to dad Graeme, mum Nichola and sister