(CBS) Niedner says he got paid about $50 a specimen and estimates he donated between 150 and 200 specimens. Conceivably, he could have more than a hundred children.

Matthew Niedner doesn’t know how many children he's fathered, although he thinks it’s no more than a couple of dozen.

"If I have information or can answer questions that nobody else can that can help those kids, then I feel very good about participating in trying to bridge that informational gap," Niedner explains.

"I have seen pictures. They e-mailed me some pictures," Niedner says.

Asked if they're good looking kids, Niedner says, laughing, "Well, there's a loaded question."

Niedner began donating sperm when he was single, and continued to do so after he got married. He and his wife, Nicole, are now expecting a child of their own.

What was his wife's reaction when he told her that he had gotten these e-mails?

"Well, I shared them with her and she was ecstatic," Niedner recalls.

Asked if it was delicate in any way, he says: "Yeah. I mean, you know, I tried to be very thoughtful and cautious about the whole thing. But she's been nothing but wonderful and loving and supportive."

Kroft asks: "When you decided to become a sperm donor, did you actually sit down and think that there were going to be babies created out of this and that someday they might try and contact you? Or you might try and contact them?"

"I guess I entertained the possibility of that. You know, I look at it a little differently," Niedner says. "This may sound a little detached, but I don't really look at these children as my children or, you know, that I'm their father. I was somebody who provided a tool or a necessary ingredient for a family to have a child that was wanted."

Niedner says he is not interested in fulfilling any sort of parental role.

"Do you think the children will think that way?" Kroft asks.

"Well, I don't think there's a blanket answer to that. I think different children will feel differently," he says.

His donor children, Wade and Lila, are each growing up without a father, which might make it harder for him to keep his distance.

For now, he's proceeding cautiously, and since the mothers of his donor children have never met Niedner or heard his voice, 60 Minutes decided to surprise Cindy and Robin with a little video preview.

What did they think?

"He's animated, like my Wade," Cindy says, laughing. "He's cute."

"Kind, you can see the kindness," Robin says. "And look at the eyebrows."

"There is my boy's eyebrows," Cindy adds.

Just this week, they met another donor sibling, Alexandra, a half-sister to Wade and Lila. Their 21st century donor family, made possible by 48QAH, is still growing.

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Since Kroft's story first aired in 2006, Cindy and Robin have seen their family grow even larger. Besides those two sisters, they have discovered their son Wade has three half-brothers.Now there are six known children from donor "48QAH." And last summer, Matthew Niedner and his wife had a child of their own – a healthy baby girl.

Produced By Mitch Weitzner ©MMVII, CBS Broadcasting Inc. All Rights Reserved.

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