(NEWSER) – A Texas family's ride to view a Christmas lights display ended in tragedy Monday night when their car was rear-ended, killing the two oldest kids, WFAA reports.

The Haltom City mom and dad and their three children had just completed a drive-through of the Christmas lights extravaganza at Texas Motor Speedway and were on their way home "in their car singing Christmas carols," the deceased's aunt tells the station.

"My sister said within seconds everything turned to chaos." That chaos came in the form of a Ford Explorer that smashed into the back of the family's car, killing 23-year-old Alexander Trejo and his 19-year-old sister, Gabrielle Estelle. The local medical examiner says the two victims, who had to be pulled from their Ford Fusion, died of blunt force trauma, per the Star-Telegram.

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