The news of the women's freedom initially made Anthony Castro happy, he said on NBC on Monday. He was like many in Ohio familiar with their longstanding disappearances.
But when his father's name and photo made media reports, and he heard Berry say his father's name, he was stunned and shaken.
"I was shocked because of the magnitude of such a crime," Anthony Castro said. "I don't think I can imagine anyone doing that, let alone to find out it was my own flesh and blood, my father. However, I did grow up in a house with a lot of fear and a lot of violence. And so, the fact that this was a violent case, no, it didn't surprise me."
Guthrie pointed out that Anthony Castro has spoken out about abuse that he and his mother suffered at the hands of his father.
Ariel Castro was "incredibly strict," Anthony Castro said.
"He had a temper. He wasn't a monster 24/7, but if you crossed him, there would be consequences. And those, more often than not, would be physical consequences.
"I remember crying myself to sleep when I was a kid because my legs were covered in welts from belts. Seeing my mom getting beat up in our own home, and no one should ever have to see their mom crumpled up in a corner on the floor the way I did so many times."
In a way, his father's imprisonment is a kind of justice for his mother, he said.
"I think that she will be there the first morning he wakes up in prison ... and the sun shines down -- that's going to be her justice."
Mixed emotions: horror, gratefulness
Had Anthony Castro been inside the house where the women were held? Had he seen any signs? Anthony Castro had been in the house, and he always entered through the back door. "That's where my father would flag me in," he said.
There were locks on the doors to the attic and basement, and the windows were nailed shut, Anthony Castro said. But that wasn't unusual. There were places he just wasn't allowed to go, he said. But he and his dad would talk in the kitchen for a short while, he said.
His family has endured a "nightmare" since May, Anthony Castro said, but he was quick to add, "nothing to compare to what the girls went through."
"What's horrifying is I have the same first and last name," he said. "I look in the mirror and I see the resemblance and I think about what he did and how horrible it was, and I just can't help sometimes just being overcome."
Anthony Castro wants his friends and co-workers to know that's he's grateful that they've supported him.
"Because of all this, my father will never be able to hurt anyone again," he said. "I have nothing to say to him."