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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Dd(13) inappropriate messages with adult dsd

219 replies

foralliknow · 02/02/2026 21:33

13 year old dd and young adult dsd. Dsd is lovely and I absolutely adore her but she didn’t have the best childhood and can be fairly erratic.

She goes out a lot and has several casual relationships with both men and women of varying ages. I don’t judge her for this, I only worry about her safety but she seems happy, works, has always been sensible around our dc and is an adult so not much we can do.

Dd has her phone handed in each night and occasionally checked. I wouldn’t normally read text messages between dd and dsd as I wanted to allow them some privacy and to trust dsd but messages came up tonight and scrolling through I am devastated by what they talk about. Details about things she’s done while drunk, the people she’s seeing and what she’s done with them.
A lot of this is dd prying for information and asking questions but they are not answers I want my 13 year old to know.

Dsd sometimes babysits dc and is due to next weekend but I can’t trust her and have changed plans, I have blocked dsd from dds phone and don’t want them messaging or spending time together alone.

Dh who is extremely defensive of dsd thinks I am overreacting, that it is normal for sisters to talk about these sorts of things and all that is needed is a chat with her to tone it down.

OP posts:
sunshinestar1986 · 02/02/2026 23:53

AmateurDad · 02/02/2026 22:35

The bit I don't get is where you say your daughter hands her phone "in" every night. Who does she hand it to? And why? Is there a particular reason it was already being confiscated overnight?

Eh?
I still take my 16 year old daughter's phone at night.
Will do so until 18.
No need for temptation and using phone in the night when they need to sleep!
Wish someone would take mine! 🤣

SPQRomanus · 02/02/2026 23:55

You are right to be very concerned, it's totally inappropriate. But what's more concerning is that your husband is ok with his daughter being a prostitute. What kind of man and father is he, and why aren't you appalled by him being ok with that?

Sweetpea333 · 02/02/2026 23:57

This is horrendous and worrying. It's clearly grooming. Your DSD is on a bad path re prostitution and sexual talk with a child. She'd never see my child again!

PixieTales · 03/02/2026 00:00

Whattodo1610 · 02/02/2026 23:52

There’s very much evidence of a crime. A 21 year old describing sex acts to a 13 year old child is abuse, the evidence is there in black and white.

Exactly this.

Your minimising of the situation is quite telling. Also the child is 13 not 14.

Theda13 · 03/02/2026 00:00

.

Thebeckhamsareeverywhere · 03/02/2026 00:02

AmateurDad · 02/02/2026 22:35

The bit I don't get is where you say your daughter hands her phone "in" every night. Who does she hand it to? And why? Is there a particular reason it was already being confiscated overnight?

You think it’s ok for a 13 year old to be alone in a room with their phone at night, what is wrong with everyone? Does no one care what kids can see?

Op, I’m with you, it’s totally wrong and at age 21 she should know this! I would talk to her and say that you don’t tell details like that to a 13 year old. You Dd is likely to look up to her Ss and she’s not setting a good example

Vivi0 · 03/02/2026 00:07

Be careful with some of the replies on this thread, OP.

As soon as the word “step” is used, people lose all sense and will defend, excuse and minimise all sorts of behaviour.

This feels like grooming to me.

I have no idea how you navigate this, but if it were me, my child and I would be taking an indefinite break from seeing stepdaughter.

Blocking her from your DD’s phone was absolutely the right thing to do.

Changingtimes81 · 03/02/2026 00:19

She's 13 & you don't monitor messages she exchanges with an adult who is as you describe. The mind boggles. Thankfully you did take time to see the inappropriate exchanges or I dread to think how it could have ended.

I would be having a diplomatic chat with dsd letting her know at age 13 you monitor her phone & feel she is too young to be party to her well meaning messages. I say this as someone who generally advocates for stepchildren to be accepted & treated as one of your own.

Allisnotlost1 · 03/02/2026 00:24

Whattodo1610 · 02/02/2026 23:52

There’s very much evidence of a crime. A 21 year old describing sex acts to a 13 year old child is abuse, the evidence is there in black and white.

What offence do you think has been committed, based on the facts presented?

Sweetpea333 · 03/02/2026 00:25

For all those brushing it off, how would you feel it the situation was an adult male and 13 year old boy? Grim isn't it?

JHound · 03/02/2026 00:27

foralliknow · 02/02/2026 21:44

I obviously can’t post their messages but details of sexual activity she’s had and with who

Her casual relationship with an older women who dd knows well and that she’s been regularly paid by a man dd also knows and what for.

That’s really unacceptable and I cannot believe your husband thinks this is ok.

I would be livid. DSD seems to be a bit stupid.

rainonfriday · 03/02/2026 00:28

NuffSaidSam · 02/02/2026 22:39

My biggest concern would be the man that is in your DD's life who is paying her (vulnerable by the sound of it) sister for sex.

Yes this. Who the heck is this man?! 😲 I wouldn't want him having any contact with DD at all (nothing realistically you can do about DSD).

I'd be concerned your DD is being groomed by DSD for prostitution. Not necessarily deliberately IYKWIM, I'm not saying DSD has malicious intentions, but it's maybe happening by default because of the over sharing. Those paying DSD could be encouraging it too, for all you know. DD growing up hearing prostitution being talked about like it's normal, isn't good.

DSD sounds like someone with no boundaries, which is generally learned in childhood I think, so bad parenting. No boundaries so getting up to all sorts like it's normal and over sharing it like that's normal too. I've known teens/20's who'd go out for the evening with no money, relying on men buying drinks and paying the taxi home using other methods. It's always the ones with sketchy upbringing. I don't know of anyone with a sound, entirely normal upbringing, without any parental neglect (or worse), who did it.

Blocking her won't work. DD will just unblock her, delete any messages sent/received, then reblock. You'll never know. I'm not sure what you can do about it, but I'd not be happy about it. ATEOTD she's only one drunken night out away (with DSD and Mr Shady), from getting involved in it herself. That's the worrying part. I imagine DD is asking for details for gossip if she knows these people DSD is involved with. That's why I say it's kind of accidental on DSD's part, if DD is actively asking for the information.

DSD is the adult though and she needs better boundaries so she can understand what is and isn't appropriate to share with DD. Goodness knows how you teach a 21yr old boundaries, who thinks everything is fine and can't see when she's being exploited, though.

Allisnotlost1 · 03/02/2026 00:28

PixieTales · 03/02/2026 00:00

Exactly this.

Your minimising of the situation is quite telling. Also the child is 13 not 14.

Who is minimising anything? There needs to be some action taken by OP and DH, but leaping to ‘report it’ is weak and useless and won’t actually protect the DD in the way some seem to think. Actually communicating with her will be more likely to build trust and support between mother and daughter, so that DD can tell her mum if she’s upset by the messages, or by any other behaviour from DSD.

Isittimeformynapyet · 03/02/2026 00:50

Would you still feel the same if ut was a male step sibling? I think not.

@Dollymylove OP is seriously NOT HAPPY about this situation and has blocked SD's number from her daughter's phone. She's also at loggerheads with her husband about it. You're talking to her as though you don't understand that.

Yes, she says she is supportive of her SD but she's clearly not supportive in this behaviour.

OtterlyAstounding · 03/02/2026 01:00

JemimaTiggywinkles · 02/02/2026 22:47

I'm more shocked you and DH are okay with DSD being a prostitute tbh. Your husband has completely failed as a father, and is repeating the pattern of awful parenting by thinking your shared DD could be living in a world where prostitution is normalised. I’d take DD completely out of the situation tbh.

All of this. It's shocking that OP isn't more worried about the fact that her DSD is clearly vulnerable and disordered around sex and relationships.

What's especially worrying, OP, is the fact that your DD apparently knows the dirty punter who is paying your DSD for sex? I'd be worried that DSD is grooming your DD into doing the same in the near future, possibly for that same man.

Motheranddaughter · 03/02/2026 01:08

It’s a matter for concern, but I think you have over reacted
Time for lots of talking

Isittimeformynapyet · 03/02/2026 01:09

JemimaTiggywinkles · 02/02/2026 22:47

I'm more shocked you and DH are okay with DSD being a prostitute tbh. Your husband has completely failed as a father, and is repeating the pattern of awful parenting by thinking your shared DD could be living in a world where prostitution is normalised. I’d take DD completely out of the situation tbh.

I get the impression that the daughter is not shared by OP and DH. Maybe he'd take it more seriously if she were.

Frostynoman · 03/02/2026 01:15

It’s definitely a safeguarding concern for your daughter. As others have said it’s a concern do your step daughter too - your husband needs to somehow understand this and support her

andfinallyhereweare · 03/02/2026 01:28

@foralliknow how would you handle it if she wasn’t your SD? And both your daughters? They are sisters, I think you’ve overrracted. Why don’t you just talk to sd about what’s appropriate to say?

Gluedtogether · 03/02/2026 01:33

I am in two minds about this - it depends on how sensible your DD is and how explicit your DSD is.
I was a teenager in the 1960s - most of my school friends (I was at an all girl's convent school) were pretty savvy about boys and "heavy petting" by 14 - (when I went to collage at age 16 there was a boy in my class who had become a father at 14).
Maybe it's better she hears about the problems and dangers for a girl from someone near her own age - she's more likely to take serious notice from them than from a parent figure IMHO.

99bottlesofkombucha · 03/02/2026 01:45

Gluedtogether · 03/02/2026 01:33

I am in two minds about this - it depends on how sensible your DD is and how explicit your DSD is.
I was a teenager in the 1960s - most of my school friends (I was at an all girl's convent school) were pretty savvy about boys and "heavy petting" by 14 - (when I went to collage at age 16 there was a boy in my class who had become a father at 14).
Maybe it's better she hears about the problems and dangers for a girl from someone near her own age - she's more likely to take serious notice from them than from a parent figure IMHO.

Edited

If you’d read the thread…

InterIgnis · 03/02/2026 01:47

OtterlyAstounding · 03/02/2026 01:00

All of this. It's shocking that OP isn't more worried about the fact that her DSD is clearly vulnerable and disordered around sex and relationships.

What's especially worrying, OP, is the fact that your DD apparently knows the dirty punter who is paying your DSD for sex? I'd be worried that DSD is grooming your DD into doing the same in the near future, possibly for that same man.

Edited

OP’s concern is rightly for her 13 year old, not the adult woman sending her inappropriate messages. Why is she regaling a child, sister or not, with stories about prostitution? I would seriously wonder if this woman is grooming her because she thinks she can make money as a pimp.

OP’s stepdaughter may or may not be a victim, but she a victim can also be a perpetrator and pose a threat to those around them. Ultimately, she is an adult that is free to make her own decisions, positive or negative. OP isn’t in a position to save this woman from herself (if she even wants saving), but she can protect her child.

99bottlesofkombucha · 03/02/2026 01:48

Allisnotlost1 · 02/02/2026 23:43

There’s no evidence of a crime. And any investigation would involve OP and DH acknowledging they know DSD is being paid for sex and being apparently fine with it. Meanwhile her relationship with her father and OP will disintegrate and the vulnerable 21 year old will be even more vulnerable. The 14 year old will learn that her mum snooping on her phone causes a tonne of trouble and will find ways to communicate in secret. Great result.

There is definitely evidence of a crime.

CypressGrove · 03/02/2026 02:04

foralliknow · 02/02/2026 21:44

I obviously can’t post their messages but details of sexual activity she’s had and with who

Her casual relationship with an older women who dd knows well and that she’s been regularly paid by a man dd also knows and what for.

This to me is the most concerning aspect - how does your DD know the man paying your 21 SD for sex? And the older woman? It all sounds very inappropriate and worrying and I'd be wanting to get my daughter far away from all of these people before she follows her step sister down the same path.

Gluedtogether · 03/02/2026 02:14

99bottlesofkombucha · 03/02/2026 01:45

If you’d read the thread…

One of my daughter's school friends used to go out with much older men just because they bought her stuff and took her to expensive places. DD told me that her parents were very religious and restrictive. Another had a druggy dad and an unloving stepmother. These were kids at the local girl's grammar...
I was pleased that my daughter was open about her friends and we could talk together about their problems.

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