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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:
Naunet · 19/05/2026 13:31

rwalker · 19/05/2026 09:41

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

So you have no basis for claiming most women know about affairs and turn a blind eye to them, but youre more than happy to push that narrative anyway, and by doing so, encouraging women to keep cheating mens secrets for them, on a website for women to support women. Amazing.

rwalker · 19/05/2026 23:38

Naunet · 19/05/2026 13:31

So you have no basis for claiming most women know about affairs and turn a blind eye to them, but youre more than happy to push that narrative anyway, and by doing so, encouraging women to keep cheating mens secrets for them, on a website for women to support women. Amazing.

Giving my point of view
isn't that what a forums for getting a wide range of experience,info and opinions

you don’t have to agree or disagree just be adult enough to respect and recognise other people have different views and opinions

PermanentTemporary · 19/05/2026 23:42

I wouldn’t tell your mum straight away, no. I’d spend time with her. But I’d pretty much always keep my nose out of other people’s relationships.

Wecanbeheroes26 · 19/05/2026 23:44

There is a thing called Wilful Ignorance. It means you keep your head in the sand. Don't ask, don't tell. Maybe your mum has adopted that attitude. If you do tell her, what is she actually going to DO with that information? Divorce & start again in her 60's? Telling her might not change the outcome, she may stay married, but it will hurt her!

CommonCents · 20/05/2026 06:46

Malyarkitsa · 19/05/2026 11:55

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.

It's not about what I'd rather. You come across as very noble, which is no bad thing, but very short-sighted. Much like I was when I stepped, nobly, into a similar situation and it blew up in my face and caused a huge problem for the whole family.

I would do what I did again but I'd do it with caution as I suggest the OP does because they have feelings, too. Cheating hurts everyone. Coming here for advice helps the OP go into it as open as they can after considering all possible scenarios.

Ffffff886 · 20/05/2026 07:01

So you don't even know if he is cheating and if you sensed it do you think his wife of so many years who lives with him doesn't know or suspect? Would you and your husband be willing to financially and emotionally support your mother with this? Potentially for the next 20 years of her life? Even if there is an affair the more people involved the harder it is to reconciliate because you will all be pressuring her to react a certain way.

DeepRubySwan · 20/05/2026 07:10

No one is going to like this reply but he's an adult man and she's an adult woman and you should just stay out of it.

DeepRubySwan · 20/05/2026 07:11

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!

I agree with this. I would say unless the couple has maintained an excellent sex life the higher libido partner probably has affairs in like 80% of cases.

thepariscrimefiles · 20/05/2026 07:30

DeepRubySwan · 20/05/2026 07:11

I agree with this. I would say unless the couple has maintained an excellent sex life the higher libido partner probably has affairs in like 80% of cases.

If OP's dad is having sex with another woman, he is putting her mum's sexual health at risk. It is unlikely that a couple in their 60s use condoms as they no longer need to prevent a pregnancy and if he just started using them now, his wife would obviously ask questions.

If it all comes out some other way, which often happens, and OP's mum finds out that OP knew about the cheating but decided not to tell her, I'm sure she would be very upset. What if OP's dad decides to leave her mum for the other woman and, at that point, tells OP's mum that she knew?

Crispsandcola · 22/05/2026 00:33

Zanatdy · 19/05/2026 04:30

You’d turn a blind eye if one of your parents was having an affair? Of course they should be involving themselves since they have found out this info. Who just finds that out and decides oh that’s not my business and just goes about their daily life, when it’s their own mother being cheated on?!

It's not about 'turning a blind eye'. It's about letting adults live their own lives and deal with their own relationships.

Crispsandcola · 22/05/2026 00:39

Swiftie1878 · 19/05/2026 07:58

??? 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.

Nope, it's not the duty of the adult child to help their adult parents to run their marriage or navigate their lives. It's the parents marriage and their business to deal with.

Crispsandcola · 22/05/2026 00:43

WhatNextImScared · 19/05/2026 08:25

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.

I am being serious. I'm an adult with an adult husband and we have adult children. I wouldn't expect them to involve themselves in any aspect of my marriage, it's not their problem.

Crispsandcola · 22/05/2026 00:50

SALaw · 19/05/2026 08:50

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

You may well think that but I don't. My husband and I are adults and our children are adults. I absolutely would not want them to get involved if either of us was cheating. It's not their problem, we are both perfectly capable of managing our lives and our marriage by ourselves.

nam3c4ang3 · 22/05/2026 01:00

Tell your mum. I told my mum when I found out - turns out she already knew. What they did/do within their marriage after that was up to them - I did my duty. They are still together now.

Zanatdy · 22/05/2026 03:46

Crispsandcola · 22/05/2026 00:33

It's not about 'turning a blind eye'. It's about letting adults live their own lives and deal with their own relationships.

Sorry but not when it’s your own mother being cheated on. Can’t believe that people are saying they’d just pretend they didn’t know and get on with their life. Fair enough if its another mum from the school gates, but you’d ignore if it was your own mother? I find that astounding.

valentinka31 · 22/05/2026 03:50

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!

I wouldn’t tell either.
You have zero certainty of what this friendship is.
Your mum has had heart issues.
Your dad shows no sign of leaving her.

She doesn’t need to know this.
She just needs him there.

My strong opinion is: leave them to it.

leopardandspots · 22/05/2026 05:02

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.

This.

A lovely friend of mine discovered her husband of 25 years had been having an ongoing affair/mistress for years (in the country where he regularly travelled for work). My friend had no idea.

What added profoundly to her hurt, was unbeknownst to her, when they were teenagers, their daughters had seen messages on their Dad’s phone. This was five years before my friend discovered it. The daughters had confronted him. He admitted it to them, but told them to maintain his secret otherwise blowing the family apart would be attributable to them.
My friend said as well as dealing with the betrayal of trust from her now exH, she found the trust issues with her daughters so hard to deal with. Whilst she understood the position they had been placed in, she still felt triply betrayed. It has affected her relationship with both daughters and they have had depression type issues, attributable to carrying his secret for so long.

Tell your Mum.

WaryHiker · 22/05/2026 05:16

Crispsandcola · 22/05/2026 00:33

It's not about 'turning a blind eye'. It's about letting adults live their own lives and deal with their own relationships.

You can't deal with your own relationship when you don't know that your partner is shagging around behind your back.

Swiftie1878 · 22/05/2026 08:02

Crispsandcola · 22/05/2026 00:43

I am being serious. I'm an adult with an adult husband and we have adult children. I wouldn't expect them to involve themselves in any aspect of my marriage, it's not their problem.

It is if they know about infidelity and are expected to ‘keep the secret’. It’s totally unacceptable.

Crispsandcola · Yesterday 00:16

Zanatdy · 22/05/2026 03:46

Sorry but not when it’s your own mother being cheated on. Can’t believe that people are saying they’d just pretend they didn’t know and get on with their life. Fair enough if its another mum from the school gates, but you’d ignore if it was your own mother? I find that astounding.

Astounding? Really? 😏 Like I said, they're both adults and it's their relationship not yours.

Crispsandcola · Yesterday 00:19

Swiftie1878 · 22/05/2026 08:02

It is if they know about infidelity and are expected to ‘keep the secret’. It’s totally unacceptable.

Nope, it's still not up to your children to 'carry' any aspect of your marriage. It's not their problem and it's not their 'secret' it belongs to the adult who is cheating.

Crispsandcola · Yesterday 00:24

WaryHiker · 22/05/2026 05:16

You can't deal with your own relationship when you don't know that your partner is shagging around behind your back.

Why not? If you don't know then there's nothing to deal with. If you find out then it's up to you as an adult to deal with it. If you have a good relationship with your adult children, they may want to support you in dealing with it but ultimately it's not their marriage and not their burden.

Vivi0 · Yesterday 01:27

I’m so sorry you are in this position OP.

I don’t know what to advise as people and their relationships are all so very different.

Not everyone is just going to LTB, take half his pension and then go on to live their best life. A lot of people do turn a blind eye to this sort of thing for many reasons - financial, no longer interested in a sexual relationship etc.

There is a very real possibility that your mum will not leave your father and you could also easily become the bad guy. This happened to a friend of mine.

It’s a really fucking shit situation for you. There is no good option. You either keep this to yourself forever, or you tell your mum and let the chips fall where they may.

Ultimately though, I think I would need to tell my mum. I wouldn’t be able to keep this to myself for what could realistically be decades and still show up at Christmas as if everything was okay. And I wouldn’t be doing it for my mum’s benefit. It would selfishly be for my own peace.

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