Three of a family, including a child, sustained burn injuries in a fire at their tin-shed house in Dhaka's Mohammadpur area early today. The injured are: Md Sohel, 35, his wife Laboni Akter, 25 and their son Morsalin, 2. The trio, in critical condition, is undergoing treatment at the Sheikh Hasina National Institute of Burn and Plastic Surgery.