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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:
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:
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 09:12

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 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 .

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.

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.

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

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