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True Crime Society

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

True Crime Society

True Crime Society

Society & Culture, True Crime

4.51.4K Ratings

🗓️ 26 February 2026

⏱️ 54 minutes

🧾️ Download transcript

Summary

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 by their devices.  

One investigating police officer described this case as "the most bizarre case I've seen in 30 years".

The family would all eventually be recovered safely, following a large-scale police investigation.  Mitchell Tromp would later say 'I've never seen anything like it. It's really hard to explain or put a word on it but they were just fearing for their lives and then they decided to flee. It was a build-up of different, normal, everyday events - just pressure - and it slowly got worse as the days went by."

Read our blog for these cases - https://truecrimesocietyblog.com/2026/02/24/folie-a-deux-crimes-events-of-shared-psychosis/

This episode is sponsored by:

NOCD - If you’re struggling with OCD or unrelenting intrusive thoughts, NOCD can help.  Book a free 15 minute call to get started

Join us on Patreon for exclusive weekly content

Be sure to follow us on Instagram for the latest crime news

Transcript

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0:00.0

The True Crime Society podcast contains adult themes and violence and is not intended for all audiences.

0:05.5

Listener discretion is advised.

0:07.6

And if you'd like to skip the intro or move to any specific part of the podcast, please refer to the timestamps listed in the episode description.

0:14.5

Thank you.

0:36.7

Thank you. What's up, guys, welcome back to the true crime society podcast with Stephanie and Olivia.

0:40.8

It is February 22nd, 2026 right now.

0:43.2

And I've had like a crazy week.

0:49.7

So anyone who is on Patreon will have seen because I've talked about it there.

0:52.9

Because, you know, I have no, I don't have a lot of friends, so I just talk to people on

0:54.2

Patreon, like they're my friends. My friends. Baby Jack, I decided on, like, was it Wednesday or

1:03.8

Thursday? I don't know. Midweek, I decided, you know what? I'm supposed to be having him

1:07.6

try peanut butter since, like, four months they told me to get it done. And I was like, he's six months old. I got to get this done. So brazenly at eight in the morning, I mixed a tiny bit of peanut butter with formula. And I was like, gave him one little spoonful. And he seemed okay. Not even a spoonful, like the tip of the spoon. I gave him two little tips of the spoon. And I was so confident. I was like, he's not going to have a reaction. Like, nobody in me or Mike's families have food allergies or anything like that. Everything I read online is like, yeah, like, it's unlikely that they're going to have a reaction the first time. And if they do, it'll be like minimal. And then you just know, not to do it again. And, you know, my sister, when she did it with my nephew, they went to the ER parking lot and did it, which is the smart thing to do. And I was like, yeah, I could do that, but I don't feel like dragging him out. My nephew didn't have a reaction. So I was like, yeah, it's going to be totally fine, like whatever. So I wasn't even that worried about. I was a little worried, but not that worried. So give it to him, he immediately starts, like, rubbing his face. And I was thought nothing of it because he's starting to teeth again, and he's been rubbing his face a lot. He starts getting really whiny or whatever. And I'm like, you know, he's always whiny. It's fine. It's still fine. So I bring him to his change table because it was also like his nap time was coming up. So I was like, let me change his diaper, get ready for his nap. So I'm changing his diaper. I'm looking at his diaper. I look back up at his face. Upper lip so swollen and puffy. And I was like, I was literally, like, shocked Pikachu meme expression.

2:35.6

Like, what do you mean he's having a reaction to a highly allergic thing?

2:40.5

I was just like, and then I'm like, fuck, what do I do?

2:43.1

I wasn't even that worried about it where I didn't even look up, like, how severe

2:45.7

of a reaction this is.

2:47.0

So, of course, I quickly Google, like, swollen from peanut butter. And it was like, this is a severe reaction. You should get medical attention right away. And I was like, fuck. So I called as doctor's office. I was like, should I go to the ER or should I, like, call an ambulance? Like, because I live like 15, 20 minutes away from the hospital. She was like, oh, do you have Benadryl? And I was like,

3:08.8

no, because of course I don't have that either. I was like, I only have adult Benadryl. And she was like, yeah, I'd probably just bring him in then. I was like, well, should I call an ambulance? She was like, I would just drive him. She's like, if it's not getting worse and he's not like having struggling to breathe, then he's probably fine to just be like driven in.

3:26.5

So of course, and I'm like, oh, fuck, I'm wearing like literally. it's not getting worse and he's not like having struggling to breathe then he's probably fine to

3:25.2

just be like driven in so of course then i'm like oh fuck i'm wearing like literally in my pajamas i'm not

3:29.4

wearing a bra i quickly like throw at least like um jeans on because that was like the most

3:35.2

accessible thing throw them in the car seat get in the car well first i had to slip on black ice also

...

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