Tin Foil Soldier

The world’s least alike twins - Dateline NBC - MSNBC.com

artificial insemination mistake, the twins are not 11.5 years old…
pretty good article

Hospital makes a ‘regrettable mistake’
After half a year of worrying and wondering, the Stuarts where about to find out if their children, who’d been side by side since life began, were biologically related at all.

Wilma: We didn’t know either what was going on. Was he my child? Was he Willem’s child? Wasn’t he either one of ours?

The possibilities were staggering: Had the lab mixed someone else’s sperm with Wilma’s eggs? Had someone else’s egg been mixed with Willem’s sperm? Or had some other couples fertilized embyro been implanted in Wilma’s womb?

Only DNA testing would answer those questions.

The twins were nearly a year old when the tests came back: The news was at once reassuring and devastating. One of the children Wilma nurtured for nine months in her womb was theirs. But the other was not.