A family of six trying to escape the floodwaters produced by Harvey has been counted among the 14 victims who died in the historic storm, authorities said.

The four children and their great-grandparents died Sunday afternoon when Samuel Saldivar, the driver of the van, attempted to pick them up amid the flooding, his sister-in-law Virginia Saldivar told the Associated Press. At one point, a strong current swept the van away and into the Greens Bayou. 

"Sam calls my husband and tells him, 'they're gone,'" Saldivar said. "That's when my husband dropped the phone and started screaming."

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