The deliveryman was making his rounds in Syosset on Saturday when he spotted flames at the home on Bluebird Drive.
Within minutes, the smoke and fire consumed the home, but not before the deliveryman alerted the people inside.
He also convinced them it was too dangerous to gather up any belongings.
"I parked up and I saw a small fire. I was like telling them to get out of the house. They went back inside so I rushed inside to get them out, and I was telling them go out through the back of the house," said Kevin Rivera.
The home was severely damaged from the fire. Firefighters eventually allowed the family back inside the home to see what could be salvaged.
The cause of the fire remains under investigation.
ALSO READ | NYPD commissioner discusses drop in shootings, rise in other crimes like robberies
Shootings are down 30% in NYC, so what is causing the spike in crime?
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a tip or story idea to Eyewitness News
Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.