On a clear December evening in 2015, four days before Christmas, Alexander Trejo and Gabriella Estelle died within arm’s reach of their parents.
The family spent its final moments together packed into a 2011 Ford Fusion, traveling south along Interstate 35W on their way home from a Christmas light display at Texas Motor Speedway.
The kids filled the back row — Alexander, then 23, on the passenger side, his 18-year-old half brother Zachary Estelle on the opposite end, and Gabriella, 19, wedged between them. Kevin Estelle, 40 at the time, drove; his wife Dee Estelle, 48, sat beside him…