A bizarre letter which appeared in the "Slate" advice column, Dear Prudence.
A man wrote in describing his ideal romance with his wife, college sweethearts who married and now have 3 children. We were both born to lesbians, she to a couple, and me to a single woman. She had sought out her biological father as soon as she turned 18, as the sperm bank her parents used allowed contact once the children were 18 if both parties consented
He claims he was never really interested in his biological origins but decided his children might need the information some day. So he, too, inquired and discovered that, ...even though our parents had used different sperm banks, it appears so did our father, as he is the same person.
He then states he has yet to tell his wife/sister and asks Prudence what he should do.
I know the whole thing sounds like a put on, and very well may be, but Prudence advised him to talk it over with his wife/sister and then the two of them should seek counseling [No! Really?]
You can read all about this sad tale at http://www.slate.com/articles/life/dear_prudence/2013/02/dear_prudence_my_wife_and_i_came_from_the_same_sperm_donor.html