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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To not be interested in a relation ho with my sister?

57 replies

Pingu99 · 29/01/2026 20:45

edit to say sorry I only just noticed the typo in the title!!

Im going to do my best to share as much as possible here so I hope this is easy to follow!

I’m 26 and the eldest of my fathers children. I have two (half) brothers, who are 15 and 16, and a half sister who is 1.

As is obvious from the above, there are large age gaps between us all. To be clear, my brothers share a mother and my sister has a different mum.

When I was younger I was expected to do a lot for my brothers when visiting my dad. From about age 12 I was expected to make their dinner, clean up after them and generally supervise them for the majority of the time I was there. As such, we have a close relationship now, although it was not always this way as I think my “parental” role meant we clashed sometimes. I feel this was largely down to my dad not standing up and saying it was inappropriate, although clearly my brothers mother is also to blame too.

As time went on I was just the built in babysitter, despite not living with them, as I ‘knew everything anyway’ and I felt a lot of responsibility. They had a rough life, no money and neither of their parents took proper care of them. I have always therefore felt like it was my duty to care for them and help them where I can.

i feel really lucky that I’ve been able to pull myself up by the boot straps into living a good life. I have a wonderful husband, a good job and feel lucky enough to be able to largely do things I enjoy without worrying.

Moving on, my dad married his much younger wife and decided they wanted a baby together.

since they had their baby I have been slated for “having no interest in her”. I will admit I haven’t seen her much (maybe three times) for a variety of reasons.

The summary of those reasons are:

I feel like if I get too involved I will once again be roped into being the free babysitter

I already feel a great duty of care to my brothers (who incidentally my father no longer has contact with) and I don’t feel I can handle another responsibility like this. I do not want children of my own, and I think this is probably due to having to care for my brothers as a child, so I don’t want this responsibility either.

I have my own life now. A life that I enjoy. I’m very close with other members of my family but not my dad nor his new wife. I don’t feel I need this relationship in my life and their child sort of accompanies this.

if I try to express any of this, I get shot down told it won’t happen or told how selfish and horrible I am that I don’t care about my own sister.

im just wondering if anyone things im being unreasonable here? Happy to be told that I am and I need to give my head a wobble!

OP posts:
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SecretSquirrelLoo · 30/01/2026 13:46

Pingu99 · 30/01/2026 09:00

My dad/his wife

edit to add; other family members don’t criticise as such but do make comments about how “it’s a shame” “not her fault” and I should “be the better person”

Edited

Well done for maintaining your boundaries in the face of that!

I’ve distanced myself from a difficult birth family myself. I care about them, but their choices are their own.

I was the capable, dependable one. Very high expectations of me, very little of anyone else. And boy did them come down on my head if I occasionally didn’t live up to what was wanted.

You sound thoughtful and wise as well as caring. Good luck xx

Shrinkhole · 30/01/2026 11:35

Pingu99 · 30/01/2026 09:03

She is awful. She has constantly slated my grandparents for not looking after her child, as they did for me. The simple reason being they’re now 26 years older! So not as easy at all for them. Equally not their responsibility.

Im not saying I’d ‘shun’ her as such but I certainly feel I can’t have a relationship with her until she is old enough to communicate herself and doesn’t require as much care (eg when she is out of nappies and can feed herself etc etc). When she’s older I’d be happy to do some small things with her, I just don’t want to be childcare at this stage

They are just on the hunt for someone else to look after their kid for free so they don’t have to. First his parents and now you. I would have nothing to do with this as boundaries will just be pushed and pushed especially since everyone else seems to enable this guy.

MrsBridgetMcClusky · 30/01/2026 11:01

Maybe a mantra might be helpful in not getting sucked into all this. I use "not my circus, not my monkeys" but find what fits for you.

Member984815 · 30/01/2026 10:08

Pingu99 · 30/01/2026 09:12

I am low contact but I don’t want to completely cut him off. Mostly for my grandparents but also if in a few years my sister could communicate a relationship I guess it would be via him

Don't give in to their requests , I think you should put yourself first . Your grandparents will get over you going completely no contact and I think your sister will come to see why you aren't in touch with your father when she gets older .

Pingu99 · 30/01/2026 09:12

Member984815 · 30/01/2026 09:06

Me too , you were parenting your brothers because he was useless and I bet nothing has changed . I'd be low contact

I am low contact but I don’t want to completely cut him off. Mostly for my grandparents but also if in a few years my sister could communicate a relationship I guess it would be via him

OP posts:
Member984815 · 30/01/2026 09:06

Aworldofmyown · 29/01/2026 20:53

I would cut the dad loose tbh.

Me too , you were parenting your brothers because he was useless and I bet nothing has changed . I'd be low contact

Pingu99 · 30/01/2026 09:03

Goditsmemargaret · 30/01/2026 08:52

Your dad is awful. What's his wife like?

I think you should not cut your nose off to spite your face regarding your sister. It's not going to be a typical sibling relationship but could be more like a niece? She's the innocent here.

I am probably biased as my DC would do anything to know their half sisters... Who have shunned them completely.

She is awful. She has constantly slated my grandparents for not looking after her child, as they did for me. The simple reason being they’re now 26 years older! So not as easy at all for them. Equally not their responsibility.

Im not saying I’d ‘shun’ her as such but I certainly feel I can’t have a relationship with her until she is old enough to communicate herself and doesn’t require as much care (eg when she is out of nappies and can feed herself etc etc). When she’s older I’d be happy to do some small things with her, I just don’t want to be childcare at this stage

OP posts:
ProfessorLeveretGrey · 30/01/2026 09:03

Pingu99 · 30/01/2026 09:00

My dad/his wife

edit to add; other family members don’t criticise as such but do make comments about how “it’s a shame” “not her fault” and I should “be the better person”

Edited

Yeah- but you've spent your whole entire life being the better person.

I have noticed consistently over my decades on this earth that everyone tiptoes around the most difficult person in the room- and it's everyone else who is expected to behave and keep the peace whereas the tossers get away with murder.

Pingu99 · 30/01/2026 09:00

SecretSquirrelLoo · 30/01/2026 08:50

Who is criticizing you?

My dad/his wife

edit to add; other family members don’t criticise as such but do make comments about how “it’s a shame” “not her fault” and I should “be the better person”

OP posts:
ProfessorLeveretGrey · 30/01/2026 08:57

sleeppleasesoon · 29/01/2026 21:36

You have done so, so much already OP. Much more than is appropriate for a 12 year old to have done.

Im sorry you and your other half siblings have to bear the emotional immaturity of your dad’s poor parenting.

Don’t let him emotionally blackmail you into babysitting your half sister. You are not responsible for her.

I hope you are able to put boundaries in this time. Good luck 💐.

I agree with this. Your dad sounds like a chaotic person at best and its the children who bear the brunt of that.

Boundaries boundaries. And if he seriously thinks he can emotionally blackmail you by calling you selfish i would think about enforcing very strict boundaries regarding him as well.

Goditsmemargaret · 30/01/2026 08:52

Your dad is awful. What's his wife like?

I think you should not cut your nose off to spite your face regarding your sister. It's not going to be a typical sibling relationship but could be more like a niece? She's the innocent here.

I am probably biased as my DC would do anything to know their half sisters... Who have shunned them completely.

SecretSquirrelLoo · 30/01/2026 08:50

Who is criticizing you?

Pingu99 · 30/01/2026 08:46

Thank you for every single comment with kind words and reassurances, I truly appreciate it.

I understand the suggestions re going no contact, but as I said I don’t want to do that for the sake of my amazing grandparents.

I feel stronger in my decision now that I am not being this evil person by not getting involved, and has harsh as it sounds it isn’t my problem in many ways.

I think I need to continue putting myself first for the first time, living my own life, and focusing on that for now.

if in the future my sister needed help or wanted a relationship of her own accord then I suppose that would be a time to reevaluate!

thank you again for the kind comments from everyone here ❤️

OP posts:
ComedyGuns · 29/01/2026 22:58

You sound like a wonderful person and you’ve done enough.

Please now take time for yourself and focus on your own family. I think you really deserve this.

Vivi0 · 29/01/2026 22:51

99bottlesofkombucha · 29/01/2026 22:47

She says their suggestions of bonding are all the type where she’d take the baby and look after her. She also says there was a risk the baby get removed, so mum may easily be quite happy with the op playing mum.

I missed this.

What a mess.

99bottlesofkombucha · 29/01/2026 22:47

Vivi0 · 29/01/2026 22:45

I don’t really want to play mum in any way,

Has anyone actually asked you to look after or babysit her? I highly doubt the child’s mother wants you to play mum in any way either.

She says their suggestions of bonding are all the type where she’d take the baby and look after her. She also says there was a risk the baby get removed, so mum may easily be quite happy with the op playing mum.

99bottlesofkombucha · 29/01/2026 22:46

‘Sorry dad I’m a bit busy supporting your sons that you’ve pretty much abandoned but great to hear you’re a better dad now to this little girl.’

Vivi0 · 29/01/2026 22:45

Pingu99 · 29/01/2026 20:53

I think this is what I struggle with. I don’t know what kind of relationship, if any, I’d want. I’m not maternal and not interested in kids so I don’t really want to play mum in any way, and it’s hardy like we have anything in common 🤣

I don’t really want to play mum in any way,

Has anyone actually asked you to look after or babysit her? I highly doubt the child’s mother wants you to play mum in any way either.

Ellie56 · 29/01/2026 22:39

Pingu99 · 29/01/2026 20:59

I think what holds me back is that she clearly didn’t ask to be born, and therefore none of this is her fault. But as I mentioned in my post, I don’t know if I can be responsible for another person.

to add, I have a very stressful and high intensity cooperate job, and my husband is a doctor. So we both have very full and at times difficult lives at the best of times.

I also have three sisters on my mums side (none share my dad) who I have a very good relationship with

No she didn't ask to be born, but you didn't ask for her to be born either! That was down to the choices and actions of her parents.

Your useless father is just after a free babysitter. It is disgraceful that as a child you were made to assume responsibility for two little boys. You didn't have any choice then, but you do now! She is not remotely your responsibility, so you should not feel guilty. She has two parents that can look after her.

Maybe later when she is older you can form some sort of relationship with her if you want to, but for now keep your distance and get on with your own life as you see fit.

And I can't believe your dad has the cheek to complain about your lack of interest in your half sister when he shows no interest at all in his sons! I would point that out to him next time he starts whingeing.

outerspacepotato · 29/01/2026 22:22

You dad used you and parentified you to take care of your brothers.

Now he just is trying to see if a guilt trip will work so you'll do the same for his 1 year old.

He's a deadbeat. He doesn't see your brothers. I'd match his energy. He guilts you about the baby, guilt him about making you your brothers' defacto parent and him not seeing them anymore. He'll soon shut his deadbeat piehole.

It might be time to consider going no contact with him if your relationship consist of him trying to use you.

Haveyouanyjam · 29/01/2026 22:16

Pingu99 · 29/01/2026 21:44

Thank you for your kind words, I truly appreciate them.

Whilst I’m pretty certain now I don’t want a relationship, I also know if she ever reached out to me with a concern I truly couldn’t live with it. I feel an immense level of responsibility to my siblings, particularly as I’m the only one with “my life put together” as such. It’s very difficult. In fact, when the wife was pregnant, my husband and I discussed if we would take the baby should she be taken away (which was a possibility), as I couldn’t live with knowing she’d be in care.

I feel so torn between obligation and finally wanting to live my own life on my terms!

You are not obligated to care for any child that you did not bring into this world or actively choose to care for.

So, do you. Be distant and make further decisions about your relationship with your sister down the line.

She isn’t your responsibility. You feel that she is because you’re caring, but you should be your own priority. You have chosen not to have children as you don’t want that responsibility (understandably).

Theonlywayicanloveyou · 29/01/2026 21:59

I don’t think you need to make a great statement about it, but just be extremely busy during the next four or five years (which by the sounds of it you are) then pop up and offer a bit more face time when your little sister is more enjoyable to be around and that time spent with her is actually positive not just you ending doing more free labour for your father

you’re absolutely right to have clear boundaries - but you don’t need to jeopardise a potentially warm future relationship by being explicit about them. Just make yourself unavailable without saying you “won’t” do it

Strangerthanfictions · 29/01/2026 21:55

Pingu99 · 29/01/2026 20:45

edit to say sorry I only just noticed the typo in the title!!

Im going to do my best to share as much as possible here so I hope this is easy to follow!

I’m 26 and the eldest of my fathers children. I have two (half) brothers, who are 15 and 16, and a half sister who is 1.

As is obvious from the above, there are large age gaps between us all. To be clear, my brothers share a mother and my sister has a different mum.

When I was younger I was expected to do a lot for my brothers when visiting my dad. From about age 12 I was expected to make their dinner, clean up after them and generally supervise them for the majority of the time I was there. As such, we have a close relationship now, although it was not always this way as I think my “parental” role meant we clashed sometimes. I feel this was largely down to my dad not standing up and saying it was inappropriate, although clearly my brothers mother is also to blame too.

As time went on I was just the built in babysitter, despite not living with them, as I ‘knew everything anyway’ and I felt a lot of responsibility. They had a rough life, no money and neither of their parents took proper care of them. I have always therefore felt like it was my duty to care for them and help them where I can.

i feel really lucky that I’ve been able to pull myself up by the boot straps into living a good life. I have a wonderful husband, a good job and feel lucky enough to be able to largely do things I enjoy without worrying.

Moving on, my dad married his much younger wife and decided they wanted a baby together.

since they had their baby I have been slated for “having no interest in her”. I will admit I haven’t seen her much (maybe three times) for a variety of reasons.

The summary of those reasons are:

I feel like if I get too involved I will once again be roped into being the free babysitter

I already feel a great duty of care to my brothers (who incidentally my father no longer has contact with) and I don’t feel I can handle another responsibility like this. I do not want children of my own, and I think this is probably due to having to care for my brothers as a child, so I don’t want this responsibility either.

I have my own life now. A life that I enjoy. I’m very close with other members of my family but not my dad nor his new wife. I don’t feel I need this relationship in my life and their child sort of accompanies this.

if I try to express any of this, I get shot down told it won’t happen or told how selfish and horrible I am that I don’t care about my own sister.

im just wondering if anyone things im being unreasonable here? Happy to be told that I am and I need to give my head a wobble!

Who are you being shot down and criticised by? Not that it matters, if your father chooses to have children generations apart that's his choice and you are not obligated to have a relationship with the new child, especially when he has treated you poorly in the past. What about your father's obligation to you as your parent? If you had a child do you think your dad would be interested and helpful. You have done enough for your dad and his wayward parenting, including overlooking his poor parenting of you, you don't need to do anything

Pingu99 · 29/01/2026 21:52

MrsBridgetMcClusky · 29/01/2026 21:51

Can I recommend the book that always gets recommended? 😆 Adult children of emotionally immature parents by Lindsay C Gibson. Its excellent, and gives practical tips for managing relationships. She does a lot of podcasts so you can 'try before you buy' to see if it rings bells for you. Acceptance and commitment therapy is excellent for 'unhooking' from unhelpful thoughts such as 'this is my responsibility'. Google Russ Harris and defusion techniques for ideas.

Thank you so much, I will certainly make note of these and look at them! I have struggled with my relationships with both of my parents so I am definitely up for anything that may help understand and process them. I appreciate your kind comments, thank yoy ❤️

OP posts:
MrsBridgetMcClusky · 29/01/2026 21:51

Can I recommend the book that always gets recommended? 😆 Adult children of emotionally immature parents by Lindsay C Gibson. Its excellent, and gives practical tips for managing relationships. She does a lot of podcasts so you can 'try before you buy' to see if it rings bells for you. Acceptance and commitment therapy is excellent for 'unhooking' from unhelpful thoughts such as 'this is my responsibility'. Google Russ Harris and defusion techniques for ideas.

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