Three children and their grandmother died in a Texas fire after trying to stay warm during power outages. Their mom survived

Loan Le and her grandchildren, Colette, Edison, and Olivia.

(CNN)When the power went out at Loan Le's house in the Houston suburb of Sugar Land, Texas, on Monday, she headed over to her daughter's home about five miles away.

Jackie Pham Nguyen and her three kids, Olivia, 11, Edison, 8, and Colette, 5, affectionately nicknamed Coco by her family, still had power and were happy to have more time with their Ba Ngoai, which means maternal grandmother in Vietnamese.
Power and water outages plagued the state of Texas last week amid an unusual deep freeze that sent many families like the Nguyen's into survival mode.
      "We thought we were really lucky because we still had power until the early evening," Nguyen said.
        When their power went out a few hours later, the family hunkered down, lit the fireplace and played board games and card games, she said.
          The kids tried to teach their grandmother some card games and the family had tired themselves out by around 9:30 p.m.
          "Tucked my kids into bed and really the next thing I know I'm in the hospital," Nguyen told CNN. "A few hours later the fireman and police officer came and said that no one else made it."

          The cause of the fire may never be known

          Nguyen doesn't fully remember what happened, she said, but recalls being on her first floor where her bedroom is and being unable to get upstairs to the children's bedrooms. She yelled for her kids.
          "I was just standing there screaming and screaming and screaming their names hoping they would come out of their rooms and basically jump over so that we could get out," she said. "I just remember feeling like it was so dark and I can still kind of hear everything crackling around me."
          Coco, Edison and Olivia Nguyen died in the fire.
          While Nguyen said she doesn't remember much else of the night, Doug Adolph, a spokesperson for the city of Sugar Land, told CNN the mother of three "had to be physically restrained from running back into the house."
          He said it took an hour or more to get the fire fully under control. The fire department arrived around 2 a.m. Tuesday.
          "The family had posted on social media that they were attempting to stay warm by using a fireplace inside the home," Adolph said, adding that the cause of the fire has not yet been determined and may never be.
          "We can't say for sure that was the cause of the fire. We just don't know yet," he explained. "It's possible that the investigation may never identify an exact cause."
          Adolph said the neighborhood had been without power for at least eight hours.
          While Nguyen suffered burns on her hands, she says the loss of her children and her mother is immeasurable.
          "My heart is broken," she said, pausing to catch her thoughts. "I'm never gonna be the same."
          "I'm in this crisis tactical mode now and I'm just really focused on all this final arrangements because this is the last sort of thing I'm going to do for my kids," Nguyen said.

          'Amazing little humans'

          When Nguyen talks about her kids, her stories about their big personalities in little bodies come to life.
          "My kids were such phenomenal, amazing, little badass humans," she said of her three children.
          Olivia and Coco would have celebrated back-to-back birthdays next month, on March 27 and 28. All three kids attended St. Laurence Catholic.
          "Colette is just a little firecracker and she has so much charisma," Nguyen said. "She also, as a 5-year-old, had that level of confidence. She was never afraid, totally unapologetic, not intimidated."
          Coco loved to dance and make TikTok videos. She loved Taylor Swift and Shawn Mendes, and wanted to be head cheerleader and class president. She was more like a teenager than a soon-to-be 6-year-old, her mother said.
          She was also very affectionate. "I knew she was my last kid but ... she was just so affectionate and I just, you know, I took that in, like, every single minute I could get it because I knew ... those moments are so fleeting," Nguyen said.
          Olivia Nguyen (right), 11, loved skiing with her mom, Jackie Nguyen.
          Olivia had a sarcastic sense of humor that got drier as she entered middle school.