The fire broke out at an apartment on Main Street in Flanders just after 4 a.m. One neighbor says it's a divided house where a number of children live.
Officials say 52-year-old Hesham Moustafa and his 7-year-old son were both killed. A 9-year-old girl believed to be the Moustafa's daughter is in critical condition.
Other residents, including the mother and an older sister, escaped the house.
The investigating is indicating there was no power to the building, and the family was using space heaters.
Officials determined that the cause of the fire was altered wiring on a space heater.
Firefighters had to battle the cold and wind in addition to the flames.
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