The Twins Who Shared Psychosis

The Eriksonn twins and a case of Folie à deux

Twins share a unique psychological bond that’s said to border on the telepathic. Due to twins being so close there have been many instances over time of shared psychosis and even suicide pacts, with one not wanting to be left alone if their sibling was to pass away. We saw such a phenomenon in the case of the Silent Twins, my most popular episode to date.

In psychology, Folie à deux is a rare psychiatric syndrome where delusional beliefs are shared between two people, usually related. It’s French for “a madness shared by two.” This week we’re looking at the case of Ursula and Sabina Eriksson, two Swedish twins who are believed to be a perfect example of the frightening illness. Born in the idyllic town of Sunne, the twins grew up with their older siblings Björn and Mona where they lived relatively normal lives. By the year 2000, Ursula was living in the USA and Sabina lived in Ireland with her partner and two children. There was no history of juvenile delinquency, criminal convictions, or even reported mental illness. So why then, in 2008, did they embark on a suicide mission by running down the M6 Motorway into oncoming traffic?

Sabina and Ursula Eriksson are twin sisters, born in Sweden on November 3rd 1967. They grew up in Sunne, Värmland, with an older sister…