The 17 bodies at the morgue do not include the bodies of six relatives found in a van in Houston on Wednesday.
They were traveling to his home on Sunday when their van was swept away.
Gonzalez said the two older adults were found in the front seat of the van and when they fished the vehicle from the water they discovered the children inside the back of the van.
Samuel Saldivar had been driving his relatives to safety when rising floodwaters suddenly "overcame" their van, according to CBS affiliate KHOU-TV, which first reported the tragedy in northern Harris County, Texas.
"It's so unfair", the children's aunt through marriage, Esmeralda Saldivar, told NBC News. "But on the other side of the bridge, the road dipped".
Although the driver - the children's great-uncle - was able to escape the auto before it went under water, the rest of the family was unable to make it out, KHOU 11 reported.
"What keeps going through my mind is the struggle, how they were trying to get out of the vehicle to save themselves", said Parades.
Authorities believe the two bodies they saw are the great-grandparents, 84-year-old Manuel and 81-year-old Belia Saldivar.
As of Monday, the Saldivars are among at least 14 dead, though that number will nearly undoubtely go up as the water recedes and the true impact of the storm becomes known.
On Wednesday, the sheriff's office was alerted that the water has subsided some, and the white van was located.
For several years, Ric Saldivar said, his parents had been losing their memories to dementia.
This 2014 photo provided by Virginia Saldivar shows her grandchildren Daisy, from left, Xavier and Dominic Saldivar, three of the four children presumed dead after their van sank into Greens Bayou on Houston's eastside.
"They basically let us know they're not going to be able to do anything until the water goes down", Ric said.
"I can already imagine Dad holding Mom's hand real tight as the water rushed in", he said. "I hope they are safe and sound and got out of the floodwaters".
The children's mother had been trying to get a boat ride so she could go to the bayou herself and look for them. "And the longer I don't see them, the longer it's not true".
"Finding my babies", she said, "that's my ultimate goal".
"Sammy said, 'Well, maybe I should go back, ' " Ric said. They then alerted the police who came to the spot.