PLANTERSVILLE, Texas -- A 51-year-old man and his two grandchildren died after their pickup truck was struck by a train as it crossed railroad tracks.

Donald Badeau and his 8-year-old grandson, Joshua Perez, died at the scene. Seven-year-old Jennifer Perez died Sunday morning at Memorial Hermann Hospital, spokeswoman Amy Berryman said.

Officials said Badeau was driving near his home in Plantersville on Saturday afternoon when he pulled onto the railroad crossing and a train slammed into the driver's side of his 1997 GMC pickup.

"For some reason he did not see the train," Grimes County Sheriff Don Sowell said. "The sun was setting in the west, so there could have been a glare or maybe he was distracted by one of the grandchildren. He lives in this area and would be familiar with the crossing."

Jennifer Perez was taken by Life Flight to Memorial Hermann with an apparent skull fracture and broken neck, officials said.

All three victims were wearing seat belts, officials said, but the railroad tracks didn't have any guard rails or signals.

Plantersville is about 50 miles northwest of Houston.