Mother Ami Dean was taken to Stafford Hospital on 30th October 2010.
The twins she gave birth to were 13 weeks premature.
After their condition deteriorated, they were transferred to University Hospital of North Staffordshire but died on November 1st.
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A man has been jailed for 16 years for repeatedly stabbing his partner before turning on her 13-year old son, who came to his mother's aid.
Staffordshire County Council discovered the rare minute-by-minute witness account.
At it's height 23 firefighters were called out to tackle the fire.