Liam Payne "acted quickly and swiftly" to rescue his guests from fire.
During a party at the 20-year-old's £2 million East London penthouse on Tuesday night a fire broke out on the veranda injuring three people.
The blaze lit up while a young man named Andy Samuel filled up the tank for a heating lamp with fuel and Andy's stepfather Matthew Baker credits Liam for his bravery.
"We are so grateful to Liam because he saved his life," Matthew gushed to British newspaper The Daily Mirror.
"The lantern just exploded as Andy was lighting it and it took the full force of the flames. Liam helped him by beating out the flames and dousing him with water. He acted quickly and swiftly."
Matthew claims that everyone is still shaken up by the incident, which saw 35 fire fighters extinguishing the flames from the Canary Wharf building and 30 residents evacuated from the premises.
Andy received burns on 20 per cent of his body, but Liam has been a pillar of support for his friend throughout.
"What happened was absolutely awful. My son is very poorly," Matthew said.
"I've spoken to Liam on the phone and he told me exactly what happened. He is very shocked himself. It's bad enough but it could have been a lot worse."
Another man and a woman are said to have suffered superficial burns to their hands in the accident.
Earlier in the day, Liam filmed a music video with his bandmates Harry Styles, Zayn Malik, Niall Horan and Louis Tomlinson.
But since the tragic event it is reported he has rarely left his friend's side in the hospital.