It was early Friday morning when the water started rising in Kerr County, Texas.

I got a call at 4 a.m. and somehow it woke me up and I answered it.

And it was my son calling to let me know that there was four inches of water in the house.

And I told him to get to the highway as fast as he could.

This is Thad Hartfield.

He was about 300 miles away from their vacation house by the Guadalupe River,

where his 22-year-old son Aidan was calling him from.

Aidan was staying there for the July 4th weekend with his girlfriend and some other of his friends.

And as they proceeded out of the house, the water, and I'm talking about maybe a minute,

the water went from four inches to four feet, and they were hanging on to some structures on the outside of the

house when a massive cypress tree came and actually hit the part of the house where they were

gathered. And Aiden's phone was in the hands of a girl named Joyce.

And Joyce told me that Aiden and the other two girls had been swept off and got hit by something.

Within seconds, the phone went dead.

And so I immediately made my way here to start my search.

Thad's been on the ground looking for his son and his son's friends for days.

That's where he spoke to our colleague, reporter Aralise Hernandez.

How are you doing this, that?

Like I said, I have to do something for my son, and my son son called me and that was a call to duty.

I'm accepting the challenge.

So far, local officials say more than 90 people were killed by the catastrophic flooding across central Texas over the weekend. Around a third were children.

Many are still missing.

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