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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

AIBU to not tell my mum about cheating dad?

73 replies

Cutie18327 · 18/05/2026 23:10

Very very long story short...

Suspicious that my dad is cheating on my mum for a period of two years. My partner has tried talking to my dad but he hasn't stopped visiting said woman. I am planning on confronting him directly (I am his daughter, so it's a very delicate situation and conversation), but my husband is under the impression that I should go straight to my mum. I worry for her health following the fall out of a potential affair.

Am I being unreasonable in wanting to confront my dad without her knowledge in the hope that he will stop? Of course if he continues past this conversation then I will tell her.

OP posts:
ThatJadeLion · 19/05/2026 07:54

I absolutely would not tell if they're in their 60s. Why do people assume the person would like to know. I certainly wouldn't. I don't believe that many of the marriages that last for decades are completely affair free. If this was me, I would turn my back and not delve into my father's life. Some will disagree but this is my view!

Swiftie1878 · 19/05/2026 07:58

Crispsandcola · 19/05/2026 00:00

It's a bit late to ask this now, but why are you and your husband even involving yourselves? They're grown adults and it's their marriage. Mind your own business and let them run their own lives.

??? You wouldn’t make sure your parents knew if one was cheating on the other?!

OP, I’d confront Dad and tell him he either comes clean with Mum, or you will out him.

O00ps · 19/05/2026 08:10

So your Dad says that it's not what you think (and affair).
In that case he has no need to hide how often he visits her.
Does your mum know that he visits the other woman at all?
In reality it does sound suspicious and that he is hiding this relationship.
He is lining up his next wife as he thinks his current appliance is breaking down and will soon need replacing.

powersthatbe · 19/05/2026 08:12

millymollymoomoo · 19/05/2026 07:48

You don’t know this is an affair. Maybe the woman is ill, maybe there’s some other stuff going on, of course you think it’s suspicious but your dad already said it’s not what you think - and it might not be. You need to tread carefully here.

what outcome would you want ? Your mum to leave ? Then what? What would divorce look like financially ?

Lol at anyone who thinks that when a man is older and starts wandering off, sneaking around late at night its probably not because he cant keep his dick in his pants but that he is tending to the sick!!

OP, tell your Mum. She deserves that dignity.

rwalker · 19/05/2026 08:23

The fact you and your Dh have made your dad and the woman aware you know and there not panicking is quite telling
Keep out of it
my guess is your parents marriage has been on it’s arse for years but the rub along in some sort of fashion

wouldn’t be surprised in the slightest if your mum knew already and turns a blind eye to eye . As long as nobody knows
YOU NEVER KOWN the complexity of people’s lives

from your mums point of view how easy would it be to start again
could she house herself and what about pension even if she got 1/2 yours dads if he’s got one her finical security is poor in retirement
people often settle for the least worst option

these are the practical implications of dropping a grenade in your mums life

WhatNextImScared · 19/05/2026 08:25

Crispsandcola · 19/05/2026 00:00

It's a bit late to ask this now, but why are you and your husband even involving yourselves? They're grown adults and it's their marriage. Mind your own business and let them run their own lives.

This isn’t a random acquaintance. You can’t just rid yourself of that knowledge about your parents. She’d basically be lying to them, and herself, for the rest of her life. Be serious.

OP, I would personally tell my dad that he had until x date to tell the mother or I would. If you’re the one to tell her he might manage to convince her that you’re lying and drive a wedge between you.

WhatNextImScared · 19/05/2026 08:26

rwalker · 19/05/2026 08:23

The fact you and your Dh have made your dad and the woman aware you know and there not panicking is quite telling
Keep out of it
my guess is your parents marriage has been on it’s arse for years but the rub along in some sort of fashion

wouldn’t be surprised in the slightest if your mum knew already and turns a blind eye to eye . As long as nobody knows
YOU NEVER KOWN the complexity of people’s lives

from your mums point of view how easy would it be to start again
could she house herself and what about pension even if she got 1/2 yours dads if he’s got one her finical security is poor in retirement
people often settle for the least worst option

these are the practical implications of dropping a grenade in your mums life

But this is also a very good point. I still couldn’t pretend though.

WhatNextImScared · 19/05/2026 08:30

It also occurs to me @Cutie18327that you mention your mum has been unwell. Any nurse will tell you that men flee women when they get sick. It’s always sisters and daughters and friends on the chemo ward with women, while wives dutifully come along. Women are least likely to file for divorce in the year after their husband’s serious illness, but men are most likely to file for divorce at this point. I think you need to prepare your mum (and yourself) for the potential that she’s going to be abandoned while unwell.

DeathNote11 · 19/05/2026 08:34

I don't envy you OP, what awful situation. Your mum being ill has likely fuelled this, plenty of research showing how men leave sick partners. Personally, I'd tell mum because to not tell her would be me going along with their deception. And I couldn't have done that to my mum, BUT I loathed my dad, so I wouldn't have felt any split loyalties.

Boomer55 · 19/05/2026 08:42

Crispsandcola · 19/05/2026 00:00

It's a bit late to ask this now, but why are you and your husband even involving yourselves? They're grown adults and it's their marriage. Mind your own business and let them run their own lives.

This. Let them sort it out.

cestlavielife · 19/05/2026 08:46

You cannot control two adults who want to to have an affair.
Telling them off will have zero impact
Telll your mum what you know so she can decide her actions.

SALaw · 19/05/2026 08:50

Crispsandcola · 19/05/2026 00:00

It's a bit late to ask this now, but why are you and your husband even involving yourselves? They're grown adults and it's their marriage. Mind your own business and let them run their own lives.

I’d think that one of your parents having an affair behind your other parent’s back IS your business?!

Corianda · 19/05/2026 08:51

Perhaps your mother knows and is still happy with her lot if she no longer loves her DH

desiderata328 · 19/05/2026 08:52

Awful situation, but I would tell your mum. If it ever comes out that you knew and didn’t tell her, you risk her feeling like she’s been betrayed by her husband AND her daughter.

Naunet · 19/05/2026 08:53

Corianda · 19/05/2026 08:51

Perhaps your mother knows and is still happy with her lot if she no longer loves her DH

God why do so many women leap to this defense for cheating men? If she knows, there's no issue with op mentioning it, but the chances of that are incredibly low.

FiveShelties · 19/05/2026 08:58

If your Mum finds out about the affair and that you knew and did not tell her, your relationship will be very damaged.

I think you should tell her.

NorthFacingGardener · 19/05/2026 08:59

I would tell your mother what you actually know and let her draw her own conclusions.

If it’s “not what it looks like” as your father says, then there’s nothing to hide.

I do think you should stop inserting yourself and your DP though. I don’t know what you thought you would gain by messaging the woman.

At this point, you’ve meddled so much that not telling your DM would make her feel like an absolute mug that she was the only one not to know and everyone else was discussing it, when it inevitably all comes out.

rwalker · 19/05/2026 09:01

Naunet · 19/05/2026 08:53

God why do so many women leap to this defense for cheating men? If she knows, there's no issue with op mentioning it, but the chances of that are incredibly low.

Nobody’s defending him
the majority of of people know about partner’s affairs
and a lot of the time they can cope if they think no one knows
at 60 rebuilding her life and housing herself are slim

yellowduckieswalking · 19/05/2026 09:04

I would talk to your dad.

Naunet · 19/05/2026 09:06

rwalker · 19/05/2026 09:01

Nobody’s defending him
the majority of of people know about partner’s affairs
and a lot of the time they can cope if they think no one knows
at 60 rebuilding her life and housing herself are slim

Where's your evidence for this claim?

gmgnts · 19/05/2026 09:21

Many years ago, when I was an adolescent, I went home to find my father had another woman in the house, in the bedroom. My mother had gone off to visit DGM for a few days. I didn't tell her when she came home, and I don't regret not having done so. My DPs had another 20 years of what appeared to be a happy marriage before my DF died. I could have blown that apart and destroyed my mother's life. Who knows, maybe she already knew and was pretending not to.

Delphiniumandlupins · 19/05/2026 09:32

I would definitely speak to your dad first. You know your mother better than any of us do. We can say "I would want to know if my husband was cheating " or "I have been married for 40 years and dread the idea of starting over on my own" but that's our experience not hers.

rwalker · 19/05/2026 09:41

Naunet · 19/05/2026 09:06

Where's your evidence for this claim?

Let’s just agree to disagree

thats the position my mum was in

there’s a world of difference form typing advice from a keyboard that will never affect you to the practicality of having to personally implement it

Malyarkitsa · 19/05/2026 11:55

CommonCents · 19/05/2026 06:26

Because it's awkward when someone confronts another person with a truth they think is unknown. It puts that person in the position of lying about knowing or defending why they're okay with what has been going on. It's even more awkward when it's your parents.

So, yes, great harm can be done. It can damage the relationship because someone has to be prepared for the prospect that the relationship between their parents isn't what they thought it was etc.

Only fools rush in.

you’d rather your child keep the worry to themselves and then have to live with the uncertainty about whether or not they should have said something, just to avoid a bit of potential awkwardness? That seems very odd and emotionally immature to me.

As I said, I’ve been where OP is. If it transpired that my mum had actually known about the affair, I’m sure she’d have probably said something like “okay thanks for telling me, I’ll deal with it, you don’t need to worry about it anymore” because she’s a grown woman capable of adult communication. Why would she have to lie or defend anything?

Mostly though, I know my mum would never want me to have the shoulder the burden of carrying (or even just, in your scenario, believing I was carrying) a secret.

ToKittyornottoKitty · 19/05/2026 12:14

Cutie18327 · 19/05/2026 07:19

Thank you all for your responses, it has definitely given me food for thought. Just to add a bit more context.

They are in their 60s and have had a happy relationship up until now.
I am concerned about my mums health as she recently (last 6 months) has had two episodes of what seemed like a heart attack
I had messaged said woman (who is a mutual friend of both of my parents and I have had contact with her in the past so it's not totally weird), and told her to stay away. She did not reply but left my message on read.
When confronted previously, my dad said that it's not what we think but he did not deny going there or seeing her.
Our main evidence is that phone tracking data (voluntary) that pinpoints him at her house and making out that he is working (he once went there in the middle of the night when my mum was asleep without even mentioning he left the house).

There are a lot of issues at play there, including close family deaths that may have impacted mental states amongst other things. But the crux of the matter is in my head I'm protecting my mum, but I realise I may be blinded by trying to save their marriage, or being afraid of things changing.

You are not protecting her, you are just contributing to the deceit and removing all choice from her. You’ve no idea if this has happened before and if their marriage has been happy, you don’t know if he’s actually cheating, if he plans to leave your mum for her, or anything really. And messaging the woman while your mum is in the dark is just treating your mum like an idiot. Either tell her, or stay well out of it.

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