and halfway across the country in wind-swept eastern wyoming. >> there i was minding my own business,ing pops up. >> reporter: -- a man named larry herdt is on the receiving end of her questions. he tells her yes, he knew her mom in the 1980s. >> i had one question. was your mother ever in the army national guard? she goes yes. >> i wanted to cry. i wanted to jump up and down. he actually knows my mother. >> interpreter: larry sa>> repo larry says they dated for a month but he didn't know she had gotten pregnant. >> loved her to death. strong woman. i appreciated that. the red hair got me. i love redheads. >> reporter: however, amanda's mother, vivian, says she doesn't remember larry at all. he was a truck driver back then. just as he is today. working out of a small city called casper, with four adult children of his own. >> there we go. we're ready to rock and roll. >> reporter: now larry herdt because the third in a list of potential fathers to agree to a dna test. >> okay. we're good. >> it's been probably about 2 1/2 weeks since he sent it in. >> reporter: it is an excruciating w