'Why did this happen?': Father of 3 children killed in house fire shares memories and anguish

'Why did this happen?': Father of 3 children killed in house fire shares memories and anguish
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Fire investigators in Sugar Land say they are focused on a fireplace and flue system in connection to the deadly fire that killed three children and their grandmother.
The kids, 11-year-old Olivia Nguyen, 8-year-old Edison Nguyen and 5-year-old Colette Nguyen, along with their grandmother Loan Le, died on February 16 as a winter storm paralyzed Texas.
Investigators say they believe the family was using the fireplace to stay warm after losing power the night before.
"We definitely want to get to the bottom of what happened. If we can even save one life, that will be worthwhile. So hopefully they can give us an answer," said Nathan Nguyen, the children's father.

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