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The family of four was injured on July 4, when deputies say 18-year-old Bayron Rivera fired a gun at them because he was upset the family's father cut him off on the road.
The family tells sister station KTRK in Houston that their 1-year-old underwent surgery Monday and is recovering.
The father and the 2-year-old remain hospitalized, and the family says the burns from the explosion left one of the children unrecognizable.
Deputies say the investigation showed Rivera used an AR-15 style rifle to fire into the family's car, which was filled with fireworks the family had purchased for Independence Day.
They exploded, and the dramatic scene that followed was caught on camera.
Police say the family and Rivera did not know each other.
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Rivera surrendered to deputies Sunday and is now being held on a $120,000 bond.
READ MORE: Suspect who shot into car carrying family of 4 and caused fireworks to go off surrenders, sheriff says
"Our main concern has been to the two children that have been severely injured and face a very long long recovery," Sheriff Ed Gonzalez said in a press conference.
The lead lieutenant on the case says Rivera told them he did not know children were in the car at the time of the shooting.
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