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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To really struggle with how my sister dealt with my mothers death (TW)

130 replies

Erandie · 23/10/2025 04:04

So first of all, trigger warning as I will be mentioning suspected suicide.

Some context, there is 15 years between my sister and I, we have different dads, were mostly raised in different countries and have very little in common. I also know we had very different relationships with our mother. I’m going to try and be a little vague but I know this might still be identifiable to those who know us.

My sister is now 25, 3 years ago in July our mother passed away, it was officially classed as an accident but we both have our suspicions that this was not the case. Prior to that I hadn’t lived with my mum since I turned 18, so almost 20 years. I know in that time she changed dramatically.
My mother had always struggled with her mental health, this wasn’t foreign to either of us but ultimately she was a good mum, at least to me anyway. Around my 27th birthday my mum moved back to her home country (somewhere I have never lived) and took my sister who would have been 12 at the time with her. My sister recounts the teen years in a very specific way, highs where she would be spoiled endlessly, followed by lows, alcoholism, pill addiction etc. My mother also had a tendency to have new boyfriends all the time. I tried to visit frequently (about every 8-12 weeks), we tried to reach out for help but ultimately you cannot help someone who doesn’t want to be helped.
My sister would have been 22 when my mother died, for the years before that my sister had modelled for a while and had good prospects but ended up giving it up to be with my mother more consistently then she enrolled in university and would call her daily and check on her often.
My sister went through a break up and dropped the visits and calls the 2 weeks before my mother passed. I continued calling but she was notorious for being less honest with me than my sister so it was hard to tell.
After her not answering my calls 2 days in a row I managed to get a hold of my sister who went to visit and unfortunately she found my mother already having passed. I took the first flight and was there by that evening, I took on the majority of the admin side as obviously my sister had a very complicated relationship with our mother and I never held that against her.
I remember very vividly my sister did not cry once, she barely wanted anything of our mother’s possessions, took a very low level interest. I wrote this off as being a mix of shock, guilt (I don’t blame her at all but I know she has been to therapy and to some extent blamed herself for not visiting more) and a consequence of their complicated relationship.
However recently I have discovered that my sister was actively going on dates (including her first date with her now boyfriend) in the 8 days between our mother’s death and the funeral. I don’t know why this has impacted me so much, as I fully understand we all grieve differently and we had very different mother daughter relationships. I try to remind myself of that but in all honestly I just feel a little bit heartbroken to think she kept moving like nothing happened.
I think it’s also one of those things where my sister was clearly my mother’s favourite child (the pretty one, the smart one, the one who modelled) but I was left to do all the really emotionally taxing stuff while she just went on dates.
She has also jokingly told me that she slept with someone the night of the day we found out. I can’t help but think I was in bed crying that night and I find the difference in our responses quite staggering.
I try to maintain a close relationship with my sister now as I know she has very limited family left but I find this response colours my view of her, even though I rationally know it’s just grief looking different on different people.

AIBU to feel like this? Is there anything I can do to get over it before it ruins our relationship?

OP posts:
playstupidgameswinstupidprizes · 23/10/2025 04:29

Your sister has done nothing wrong. You can feel as you wish to feel, but you won't change her feelings or behaviour by doing so.

Possibly you feel guilt about the reality that your sister had a much harder life than you after she was left at the age of 12 living alone with her very unwell and unstable mother and a string of men coming and going, and later giving up her dreams possibly at her mother's insistence, and perhaps you would like to shift some blame onto your sister rather than blame your mother.

Possibly not, hard to say.

Radical acceptance therapy might help you let go of the desire to control your sister's responses and feelings.

Erandie · 23/10/2025 04:27

Anditstartedagain · 23/10/2025 04:23

Did your mother emotional abuse and neglect you or just your sister?

Honestly I struggle with that question, as ultimately she was never the most consistent parent, when she was married to my sisters dad she frequently had affairs and there was an expectation id keep this secret. But ultimately I always came home to a sober mother, who always made dinner and I didn’t have a parade of men throughout my teens.
My sister did have to parent herself more and had to deal with much more extreme circumstances.

OP posts:
Marcusparkus · 23/10/2025 04:26

Sorry about your DM. It's difficult to know what to say. Why do you expect your sister to respond the same way as you? Because your way is somehow right and hers isn't? You need to reclaim the moral high ground for some reason so she needs to pay the price? I don't get it, but these are questions for you, not your sister. It's your problem, not hers.

I was 21 when my mother died, cancer not depression. I thought I wouldn't cope. After years of fearing it, when it happened it was a relief. I did similar to your sister. My father died a couple of years later. I went out clubbing after his funeral. No-one saw me for a couple of days afterwards. I only judge people who judge.

Anditstartedagain · 23/10/2025 04:23

Did your mother emotional abuse and neglect you or just your sister?

Yamamm · 23/10/2025 04:17

I voted YABU because it’s not fair to expect someone to comply with your idea of how to grieve. I do think you’ve recognised that. It’s better than if your sister had fallen apart so I see it as a good thing.
She is almost a generation younger than you. I have a brother with the same age gap and it probably wasn’t until well into his 30s that we really connected. Coincidentally we also lost our mum young although he would have been about 30. The older siblings all took charge of all the funeral and practical stuff and we probably did expect little of him even at that age. 22 is really quite young!
You recognise a little resentment on your side but it’s not your sister’s fault. And as you say she had her own difficulties when your mum turned unreliable when sister was a young teen.
I’d be glad your sister has resources and her own life. I’m sure you’ll grow closer as the years pass.