INSIDE EDITION - One Houston family lost six of its members when Harvey's historic flooding swept away four children along with their great-grandparents.
The unthinkable happened Sunday when family members say Sammy Saldivar attempted to drive his kids and grandparents to safety as floodwaters raged around their Harris County home.
After borrowing a van from a family member, Sammy was driving them over a bridge when the water overtook them.
"The water picked the van up, and it was just floating after that," family member Ric Saldivar told KTRK. "It went head first in, and water came in real fast."
Panicked, Ric said Sammy was able to unbuckle his seatbelt before pulling himself out a window. He saved himself by grabbing a tree branch.
Sadly, not everyone was as lucky.
Devy Saldivar, 16; Dominic Saldivar, 14; Xavier Saldivar, 8; and Daisy Saldivar, 6, likely perished along with their great-grandparents.
Ric said Sammy watched, horrified, as the van sank and was swept away before his family was able to climb out.
"That keeps playing in his head," Ric said.
The Saldivars are now presumed to be among more than a dozen fatalities linked to the unprecedented weather disaster that continues to have Houston in its watery grip.
Some 11 trillion gallons of water are believed to have fallen on the metropolis since the weekend, leaving thousands stranded in emergency shelters.
As of Monday, the Saldivars are among at least 14 dead, though that number will almost undoubtely go up as the water recedes and the true impact of the storm becomes known.
A GoFundMe was set up to raise money for the family.