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Mumsnet has not checked the qualifications of anyone posting here. If you need help urgently or expert advice, please see our domestic violence webguide and/or relationships webguide. Many Mumsnetters experiencing domestic abuse have found this thread helpful: Listen up, everybody

Is it okay to have a casual relationship with someone that might cause upset in the family?

149 replies

sweetsandcakes · 25/10/2025 18:02

The man in question is my mum’s cousin. Think he is my 2nd cousin. Share about 0.5% more DNA than the general population would do at random so technically not very genetically linked

My mum is very, very easy going but I wonder if this would cause trouble if word got out. Think that side of the family are extremely easy going and friendly. But maybe they’d enjoy the drama of this if they knew. Or if a pregnancy came out of it, for example. I get the sense we are the type to revel in scandals! That’s not going to happen and just an example of how the family dynamic works

He is older than me. Bit younger than my mum. My mum did have me fairly young.

Like many families nowadays, they saw each other a few times a year as children. But possibly see each other once every few/5 years at maximum now. We met at a family event in the summertime. I am now late 20s

This is possibly going to lead to sex. Maybe. Currently messaging each other random stuff. I like him a lot. Definitely want to sleep with him. Can’t and don’t want anything serious, for so many reasons, not just because we share a family tree!

Wondering if my mum will find this somewhat amusing or possibly upsetting? I don’t know. I share absolutely everything with her usually and we are good friends.

OP posts:
GoBackToTheStart · 25/10/2025 18:23

It’s your mum’s first cousin. Of course she’s not likely to smile and send you on your way to his place. Keep it out of the family. There is zero reason to date a relative, even casually.

Edited because a pp is quite right, he’s your first cousin once removed.

sweetsandcakes · 25/10/2025 18:24

FaceBothered · 25/10/2025 18:22

Yes, why do you ask?

Do you think not wanting your DD to shag her cousin makes a parent not close?

No, I don’t think that at all. And didn’t mean it to come across that way - genuinely just trying to understand a bit better

OP posts:
JLou08 · 25/10/2025 18:24

I'd be disgusted and fuming if one of my cousins started a relationship with my DC. If they'd known them as children it would be so much worse.

MagpiesAreBastards · 25/10/2025 18:24

Playing with fire. Don't do it.

Pleasegetmeacoffeesotired · 25/10/2025 18:24

Can't you just sleep with a man you're not related to? There's plenty of them about.

MannersAreAll · 25/10/2025 18:24

I'd also be questioning the motives of a much older man who would happily cause trouble in a family just for a casual shag.

Risking damaging someone in their 20's relationship with their Mum is something most decent people would never, ever risk doing. Let alone for something casual.

ButtonMushrooms · 25/10/2025 18:25

sweetsandcakes · 25/10/2025 18:06

Thank you for replying - I imagined most people would’ve said the opposite, as in, if it might potentially be serious they wouldn’t risk it? But they might for sometime casual

I will definitely reflect a bit and take time to think of any potential fallout

I agree with @MannersAreAll. Why cause all the upset if it's not even going to be serious anyway? I can't work out why you think the opposite?

sweetsandcakes · 25/10/2025 18:27

ButtonMushrooms · 25/10/2025 18:25

I agree with @MannersAreAll. Why cause all the upset if it's not even going to be serious anyway? I can't work out why you think the opposite?

i suppose because my line of thinking is, it’s just a fun time and some sex. Whereas something serious would have lingering complications and obviously everyone would know

My hope would be that it would remain hidden and just something we once did

OP posts:
lambdressedasspam · 25/10/2025 18:28

How would you rate your general mental / emotional health? Are you In a good place over all? Do you feel pretty secure in yourself/ life atm ? Any traumas/ break ups your still healing from ?

HollowBones · 25/10/2025 18:28

Adding 2nd, or once/twice removed doesn't mean they are not also your cousin

Dora33 · 25/10/2025 18:28

If he is your mum's 1st cousin, that would make him your 1st cousin once removed. Far too close a family member to be having a serial relationship with.
None of my siblings or I would be ok with any of our children having a relationship with 1 of our cousins.

CorneliaCupp · 25/10/2025 18:28

It's a firm no from me!

MannersAreAll · 25/10/2025 18:28

My hope would be that it would remain hidden and just something we once did

Things like this very rarely stay hidden.

strawgoh · 25/10/2025 18:29

You share about 0.1% DNA with an unrelated random stranger. That's because you are both the same species - homo sapiens.

You share anywhere between 3% to 8% with a first cousin once removed.

OP - your percentages are way off.

Umy15r03lcha1 · 25/10/2025 18:31

I'd go ahead and have some fun. He's not a close relative, and you both like each other.

if you did end up having a lasting relationship and babies, there's no harm in it. The genetic connection is quite remote.

The question is whether you tell anyone in the early days before you know where it's going.

strawgoh · 25/10/2025 18:31

sweetsandcakes · 25/10/2025 18:27

i suppose because my line of thinking is, it’s just a fun time and some sex. Whereas something serious would have lingering complications and obviously everyone would know

My hope would be that it would remain hidden and just something we once did

It is fine to have a fling with a stranger and keep it quiet.

But... don't shit on your own doorstep, as the old saying goes.

FrodoBiggins · 25/10/2025 18:31

sweetsandcakes · 25/10/2025 18:08

As I say, I met him at a family party in the summertime

Like all the same music. He has stunning eyes. Makes me feel very happy and safe about our connection so far

You probably like his eyes because they remind you OF YOUR MUM

sweetsandcakes · 25/10/2025 18:33

FrodoBiggins · 25/10/2025 18:31

You probably like his eyes because they remind you OF YOUR MUM

Lol stop. This made me laugh out loud

They don’t look anything alike. He is like his mum (not related to me)

OP posts:
FuzzyWolf · 25/10/2025 18:34

I wouldn’t risk hurting or embarrassing my mum, who you say you are good friends with, for a few meaningless fucks. I mean, who really does that?!

sweetsandcakes · 25/10/2025 18:35

lambdressedasspam · 25/10/2025 18:28

How would you rate your general mental / emotional health? Are you In a good place over all? Do you feel pretty secure in yourself/ life atm ? Any traumas/ break ups your still healing from ?

I am generally happy overall. One disabled DC. Divorced. Co parent well and no issues thankfully

I don’t think I get on with anyone I seem to meet my age now. My life experiences are wildly different - not just because I got married young, but I am also responsible for a disabled child

All good friends of mine are between 30-50. All of us with a lot in common

So, I suppose my perception is a bit off because of all this

OP posts:
Cucy · 25/10/2025 18:36

There’s literally 100s of decent single men out there.

Its one thing if you fell madly in love and then found out you were related but to know this and then attempt a FWB or more is just grim.

Its like ex BILs etc, it may not be blood but it’s still grim and comes across as a bit desperate like you can’t find anyone else.

I’m sure you can find someone else OP perhaps join OLD.

Tomorrowtodaywhenever · 25/10/2025 18:37

Sorry no, if you know you are related, even a little bit, it's just wrong.

JLou08 · 25/10/2025 18:37

sweetsandcakes · 25/10/2025 18:33

Lol stop. This made me laugh out loud

They don’t look anything alike. He is like his mum (not related to me)

When I read the comment about you feeling safe with him I thought it's probably because your family. I've met family members for the first time as an adult and we have instantly connected and felt comfortable together. It doesn't mean I should be having sex with them, quite the opposite.

FlippyKiYayFlippyFlipper · 25/10/2025 18:37

Grim.

Has he pursued you OP? Is he trying to cause family issues?

yeesh · 25/10/2025 18:43

that is vile. We are a laid back family but this would cause ructions. I would never forgive my cousin.