Meet the Other Phone. Only the apps you allow.

Meet the Other Phone.
Only the apps you allow.

Buy now

Please or to access all these features

AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Is this illegal?

373 replies

CarlStoleMyUnderpants · 04/03/2026 14:12

Discovered someone is cheating on his wife and have contacted two of his siblings to tell them so they can surreptitiously investigate and look out for the wife. I can't prove it as it would be hearsay, but I hoped they'd try and look at his devices or keep an ear out to gain evidence. Have I gone too far? I absolutely know this is happening.

OP posts:
CarlStoleMyUnderpants · 04/03/2026 15:29

BillieWiper · 04/03/2026 15:28

No it's not illegal to contact someone you don't know once to give them what you believe is truthful information. But if you were to keep contacting them when they've either ignored you or told you to stop it could go into the realms of harassment.

No, I wouldn't continue to contact them if they told me to stop communication nor would I follow up if they didn't reply.

OP posts:
Shatteredallthetimelately · 04/03/2026 15:30

CarlStoleMyUnderpants · 04/03/2026 15:21

Just a silly example. To avoid me saying the White Bear in Tunbridge Wells.

Ah, nicely dropped, so this the next rendezvous place?

What time will all turn up?

CarlStoleMyUnderpants · 04/03/2026 15:30

Lovemycat2023 · 04/03/2026 15:28

Have you had a look at the act? It covers none of the actions you’ve mentioned so not illegal. Unless perhaps you’ve included some very explicit details of sex acts?

I've not done anything like that no, just given a heads up. I've not even named the AP. There may be more than one for all I know.

OP posts:
raspberets · 04/03/2026 15:33

CarlStoleMyUnderpants · 04/03/2026 15:26

I can't get proof, other than getting the APs phone and forwarding things to myself, which would be illegal and also offensive material, or taking pictures if I know where they are. But I'm not Robin Ellacott so I wouldn't be very good at it.

Crikey. What to do now then?

LuciferTheMorningStar · 04/03/2026 15:33

One of the weirdest things I've read on here.

I misread at first, thinking you told everything to her siblings. That's odd enough. But HIS sibs? What...

If someone told me such about my brother, I'd go straight to him, tell him what I know, and advise him to delete all the evidence, cover his tracks better/prepare a good cover story, if he still wants to stay with his wife. My loyalties lie with my brother; I don't give a shit about his wife. One day she's the wife, next day he might have another, I really wouldn't care.

allthingsinmoderation · 04/03/2026 15:34

i dont think its illegal to say to anyone that you think someone is cheating.
How do you know this man is cheating?
Do you have evidence to prove he is cheating?
Why did you choose to tell this mans brothers rather than his wife or the man himself ?

raspberets · 04/03/2026 15:34

LuciferTheMorningStar · 04/03/2026 15:33

One of the weirdest things I've read on here.

I misread at first, thinking you told everything to her siblings. That's odd enough. But HIS sibs? What...

If someone told me such about my brother, I'd go straight to him, tell him what I know, and advise him to delete all the evidence, cover his tracks better/prepare a good cover story, if he still wants to stay with his wife. My loyalties lie with my brother; I don't give a shit about his wife. One day she's the wife, next day he might have another, I really wouldn't care.

What are you doing on mumsnet!

😀

Crunchymum · 04/03/2026 15:35

CarlStoleMyUnderpants · 04/03/2026 14:57

No, I am absolutely and definitely not. If you'd RTFT you'd know that, too., @Crunchymum

Edited

Not sure why you are tagging me, I asked if you were the affair person at 14:19 when you were still being very vague and unclear.

You since clarified it is your friend.

viques · 04/03/2026 15:35

I can’t prove it as it would be hearsay

You are not proving something in a court of law!

PaddingtonsMarmaladeSandwich · 04/03/2026 15:35

CarlStoleMyUnderpants · 04/03/2026 15:21

I didn't know she wasn't in contact with him when I got in touch with her.

If you don’t know the man very well, how did you get contact details for his siblings?

Thanksforyourlackofthought · 04/03/2026 15:35

So you don’t know the husband and you barely know the wife but you know the women he’s having the affair with very well?

Shatteredallthetimelately · 04/03/2026 15:36

CarlStoleMyUnderpants · 04/03/2026 15:24

No. I was only concerned about the malicious communication aspect. I'm so pissed off with my friend for doing it I'm not bothered about that, though it's a shame to lose a 20+ year friendship over a snake of a man.

Seriously though, I do see your point here.
I'd be pretty furious if a friend of mine was having an affair with a married person, to me it's just not the done thing.

They should either get together openly and stop making the wife look stupid, for want of a better word there, or your friend after 4 years really needs to wake up and realise she's just his sloppy second and end the relationship herself.

BillieWiper · 04/03/2026 15:40

CarlStoleMyUnderpants · 04/03/2026 15:29

No, I wouldn't continue to contact them if they told me to stop communication nor would I follow up if they didn't reply.

Fair enough then. It's not illegal. Why did you think it would be illegal to contact someone? How would anyone ever communicate?

Therescathairinmybath · 04/03/2026 15:40

Maybe the wife already knows and doesn’t care. Some women want to stay married but don’t want a physical relationship.

BauhausOfEliott · 04/03/2026 15:43

Reading through all the OP's posts in this thread, I'm pretty sure that their concerns about illegality probably stem from the fact that there is a hell of a lot more to this story - specifically about her own behaviour - than she's letting on.

Put it this way, I wouldn't be surprised if another thread popped up at some point along the lines of 'A distant acquaintance of mine has become convinced that my husband is cheating on me and her behaviour towards him has now reached the point where it could be construed as stalking. She's devoted hours and hours of her life to trying to prove he's cheating, including contacting his siblings - she's never even met him, let alone them. AIBU to speak to the police now?'

raspberets · 04/03/2026 15:44

BauhausOfEliott · 04/03/2026 15:43

Reading through all the OP's posts in this thread, I'm pretty sure that their concerns about illegality probably stem from the fact that there is a hell of a lot more to this story - specifically about her own behaviour - than she's letting on.

Put it this way, I wouldn't be surprised if another thread popped up at some point along the lines of 'A distant acquaintance of mine has become convinced that my husband is cheating on me and her behaviour towards him has now reached the point where it could be construed as stalking. She's devoted hours and hours of her life to trying to prove he's cheating, including contacting his siblings - she's never even met him, let alone them. AIBU to speak to the police now?'

I get the impression OP is a bloke,

ButIloveher · 04/03/2026 15:55

CarlStoleMyUnderpants · 04/03/2026 14:17

Mumsnet doesn't like that. I'd be accused of blowing her life up, of interfering, told she probably knows anyway, they are swingers, that sort of thing. I thought this way someone could try and find some evidence and then confront him.

No it’s not illegal but yes you are unreasonable. You should confront the man in question yoursef.

Do you always make important based on what mumsnet will ‘like’?

PinkyFlamingo · 04/03/2026 15:58

CarlStoleMyUnderpants · 04/03/2026 14:34

No I don't. I want him to stop what he is doing as he is betraying his wife.

Not nice behaviour but nothing to do with you .

nothingtoseehereatall · 04/03/2026 16:07

@BauhausOfEliott I agree with this.

Though also... OP i feel like you've read a book with a plot revolving around slander, hearsay and malicious communication and totally misunderstood what any of it means. Unless you've written any of it down (probably in a national newspaper) when it becomes libel, then slander is almost impossible to prove in the UK. Malicious communication, meanwhile, is also extremely rare (fewer than 1,000 cases last year I think) and almost entirely relates to social media.

NONE of this is relevant for what you are talking about. Gossip, is the word you are missing. Unless you have proof, it's just gossip. You don't even know what's on this guys phone, do you? He might have deleted any evidence whatsoever (if it exists).

DrVivago · 04/03/2026 16:08

I'm not sure I fancy the Mexican Discotheque, but the White Bear at Tunbridge Wells sounds OK.

Does it do food and cask ales? are dogs allowed in?

Does the Mexican Discotheque allow dogs ? ( maybe only chihuahua's? )

ticketwoes · 04/03/2026 16:09

This is all very strange.

you are friends with the AP, yes? How do you know the man? How do you know his wife?
why did you decide to go to his siblings, instead of her?

I once went to my friend and told her my concerns that I thought her husband was having an affair. There was no smoking gun, I said that from the outright, but a fair bit of circumstantial evidence

it didn’t cross my mind to go to anyone but the person involved tbh, so I can’t quite understand your logic.

GreyBeeplus3 · 04/03/2026 16:14

CarlStoleMyUnderpants
Is it really any of your business?
Am getting serious "Mrs Doyle" from "Father Ted" comedy sitcom vibes at all this
Remember the road to hell is paved with "good intentions"
And the siblings may hate the wife and not care anyways
So why would they??

Solongtoshort · 04/03/2026 16:17

Instead of all the cloak and dagger-ness about this why don’t you just message the wife, give her your friends address and tell her to go round and speak to her to get the truth, unless your friend would lie and say l have never heard of him, which l don’t think she would because she will think it’s her chance to get her man (although not a very good man she is obviously into him). I imagine if the sibling he is in not in contact with speaks to either him/wife they will make it out to be trouble making rather than truth. I imagine the truth will out somehow anyway and since your not friends you aren’t going to hurt your and the wife’s friendship. So why not just tell her.

loislovesstewie · 04/03/2026 16:18

I really can't understand why you are so invested in this. Are you going round like a latter day witch finder general rooting out so called guilty parties? Is something lacking in your life?

MyDeftDuck · 04/03/2026 16:21

The only illegal part would be if it wasn’t true and you were accused of making slanderous comments but I believe that’s a civil matter 🤷‍♀️

Swipe left for the next trending thread