One man has reportedly just found out that he and his wife, the mother to his three children, are half-siblings -- but he has yet to tell her the news.

In a "Dear Prudence" letter, a husband tells contributor Emily Yoffe that he and his wife were both "born to lesbians" -- he to a single woman and she to a couple.

Unlike his wife, who'd met her biological father when she was 18, the man never felt the need to find his sperm donor until recently. His findings have left him in turmoil.

It turns out, his mother and his wife's mothers had gone to different sperm banks, but, as the man writes, "it appears so did our father."

To Yoffe, he describes his anxiety in telling his wife and even that he is considering keeping the discovery a secret.

"I can't help but think 'This is my sister' every time I look at her now," he writes.

Yoffe gives optimistic feedback regarding the couple's marriage.

"I think there's way too much emphasis put on DNA," she writes back. "Yes, you two will have had a shock, but when it wears off you will be the same people you were before you found out."

She also discusses how, or rather if, the pair should relay the news to their children.

Because the writer is anonymous, skepticism surrounds the letter. One "Dear Prudence" reader suggests that the story is "a fiction pushing a political agenda."

Yoffe acknowledges the chance for a fake, but asserts that she rarely publishes stories that wind up being false.

In the past few years, the sperm bank industry has experienced controversy quite often.

Most recently, one sperm donor in Kansas had to fight an effort to force him to pay child support for a child conceived through artificial insemination by a lesbian couple.

More famously, a scandal ensued in 2011 when the New York Times reported that one man fathered 150 children through sperm donation.

Also on HuffPost:

Loading Slideshow...
  • Crawford Quadruplets

    Miranda and Josh Crawford's quadruplets, two sets of identical twins, were born six weeks early, on Feb. 4, 2011 in Charlotte, N.C. From left, Mia, Jackson, Madison and James, are all healthy and have gained about 3 pounds each.

  • Shepherd Triplets

    The Shepherd triplets, from left, Bethany, Ryleigh and Megan, are record breakers after being born a staggering 11 years apart. Bethany and Megan were born in August 1999, while their triplet sister Ryleigh remained as a frozen embryo in storage. She was born in November 2010

  • Triplets for a triplet

    Amber Ali, who is one-third of a set of triplets, gave birth to a trio of boys May 26 at Sinai-Grace Hospital in Detroit. In the new mom's arms are, from left, Amir, Armann and Amari Whitaker. She is flanked by her sisters Asia, left, and Ashley. "It's going to be fun," Ali said.

  • Octomom Nadya Suleman

    In this April 13 photo, Nadya Suleman holds all eight of her babies, who were born Jan. 26, 2009, in California. Her decision to have so many babies sparked an outcry from many in the public who questioned her fitness to provide for them -- and the six children she already had. Critics also blasted doctors for fertilizing her with so many eggs.

  • First Octuplets

    Nkem Chukwu, right rear, and Iyke Louis Udobi, center, are the parents of the first U.S. octuplets to survive birth. They were born in 1998; one died a week later. Here, the couple pose on Jan. 28, 2009, with Chukwu's mother and the seven surviving octuplets, plus a later addition -- a daughter, third from right, who was born in 2002.

  • McCaughey Septuplets

    The McCaughey septuplets, born on Nov. 19, 1997, in Carlisle, Iowa, were the world's first surviving septuplets. Their parents are Kenny and Bobbi McCaughey. Here, they pose for a photo with their older sister Mikayla, top center, in April 2003, when they were 5.

  • Becki and Keith Dilley's Sextuplets

    Becki and Keith Dilley welcomed the U.S.'s first set of surviving sextuplets into the world in May 1993. The children are in high school now. The family lives in Indianapolis.

  • Dionne Quintuples

    The five daughters born to Elire and Oliva Dionne of Callander, Ontario, in May 1934 are the world's first known quintuplets. They became a media sensation. Canada's government took custody of them and turned them into a tourist attraction. Their parents regained custody after a nine-year battle, but the girls broke off contact with them as adults. The quints posed for the top photo in 1934; the bottom one was taken in 1950.

  • The Fischer Quintuplets

    Andrew and Mary Ann Fischer are parents of the first surviving quintuplets in the United States. The children were born in Aberdeen, S.D., in 1963. Here, the family rides in a parade in their honor in an undated photo.

  • Two Wombs

    Shane and Sarah Reinfelder, of Sault Ste. Marie, Mich., hold their day-old twin girls, Valerie Marie and Kaylin Joy, on Feb. 27. The babies were born from two separate wombs in Sarah's body. They joined brother William, who was 10 months old.

  • Grandma Mother

    At age 51, Rosinete Palmeira Serrao, center, gave birth to her own twin grandchildren in Brazil in September 2007. She was a surrogate for her daughter, Claudia Michelle, left.

  • Egyptian Septuplets

    An Egyptian woman who took fertility drugs in hopes of having a son got her wish -- and then some. Ghazala Khamis gave birth Aug. 16, 2008, to four boys and three girls. They weighed between 3.2 pounds and 6.17 pounds.