The Harris County Sheriff confirmed the grim discovery in a tweet.
Update Aug. 30: Authorities have found the white van that was swept away in floodwaters with 6 family members inside.
Gonzalez said divers recovered the grandparents, Belia and Maneul Saldiver, on Wednesday and expected to find the four kids in the van, according to the report.
Police say the elderly couple's son Samuel "Sammy" Saldivar, told them he was driving eastbound on Green River Rd. near John Ralston Rd. when rising water in Greens Bayou overcame the van in which they were traveling and swallowed everyone except the driver. As thousands of others around the Houston area similarly sought refuge from the unrelenting wrath of Harvey, he drove over a waterlogged bridge heading over Greens Bayou in eastern Houston, encouraged by his father to do so in spite of the apparent danger of the waters.
The four children were identified by Hiser-Jackson as Devy Saldivar, 16; Dominic Saldivar, 14; Daisy Saldivar, 6; and Xavier Saldivar, 8.
Six members of the same family are believed to be dead after their van was swept away in floodwaters caused by Tropical Storm Harvey over the weekend, Houston-area television station KHOU reported Monday.
The driver was able to hang onto a tree limb and escape. "They were good kids". Based on these conditions, deputies were not able to retrieve the van or the people inside of it at the time.
He added: "I can already imagine Dad holding Mum's hand real tight as the water rushed in".
"He's still blaming himself, he was trying to do the right thing to get them out of the flood. and it just happened".
Houston police Chief Art Acevedo told The Associated Press that he had no information on the reported drowning, but he told the wire service that he is "really anxious about how many bodies we're going to find" from Harvey's devastating flooding.