Folie À Deux Cases / Shared Madness | Ursula and Sabina Eriksson & The Tromp Family

Folie À Deux Cases / Shared Madness | Ursula and Sabina Eriksson & The Tromp Family

From True Crime Society by True Crime Society

February 26, 2026 · 52 min

About this episode

The episode discusses the shared madness of twins Ursula and Sabina Eriksson and the bizarre case of the Tromp family.

Timestamp to skip the intro chat: (13:36) Folie à deux is a French term that means ‘madness of two’. It can also refer to a shared psychosis or a shared delusional disorder. In 2008, identical twins Ursula and Sabina Eriksson were acting erratically. They had traveled to England from Sabina’s home in Ireland. The sisters were asked to leave a bus that they had been traveling on as they were acting paranoid and would not let the driver search their belongings. After they got off the bus, the sisters ran into oncoming traffic on a motorway. Ursula would be hospitalized for months, while Sabina was released soon after the event. Sabina would wander the streets of Stoke on Trent in England, looking for her sister. A man named Glenn Hollinshead took pity on Sabina and took her in. Sabina would end up killing Glenn by stabbing him five times with a kitchen knife. Neither sister has given any reason for their actions. We also discuss the strange case of the Tromp Family. In 2016, Mark and Jacoba Tromp fled their home in Silvan, Australia, along with their three adult children Ella, Mitchell and Riana. The family were convinced that people were after them and that they were being tracked…

People in this episode

Host: True Crime Society

Topics covered

  • shared madness
  • psychosis
  • true crime
  • family dynamics
  • bizarre cases

Keywords

  • Folie à deux
  • Ursula Eriksson
  • Sabina Eriksson
  • Glenn Hollinshead
  • Tromp Family
  • true crime
  • psychosis
  • bizarre cases

Mentioned in this episode

Places: Ireland, England, Stoke on Trent, Silvan, Australia

More episodes of True Crime Society

Explore listener stats, chart rankings, contacts and more on the True Crime Society podcast page.