Jeremy Mason died from the effects of carbon monoxide poisoning, said a spokesman from Derriford Hospital, Plymouth, Devon.
On Saturday, his father, Michael Mason, 45, of Fulham, south-west London, and his brother, Christopher, four, died in the fume-filled cottage. His mother, Deborah, 30, died at the hospital on Sunday. Neighbours found the family unconscious in the cottage on Saturday. Post-mortem examinations will be held but Devon and Cornwall Police said there were no suspicious circumstances. The flue was blocked at the top and bottom by twigs and moss.Reuse content