The blaze broke out around 7:30 a.m. Thursday on the 100 block of Oldbury Drive.
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Two men and Two women escaped the flames before firefighters arrived.
VIDEO: 4 injured in house fire in Hockessin
They were all taken to Christiana Hospital, suffering with minor smoke inhalation.
The fire marshal says the blaze started inside a rear family and was caused by a burning candle which ignited oxygen tubing and other flammable materials.
The damage to the home is estimated to be about $200,000.