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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To ask if you have half siblings

85 replies

Vibted7777 · 17/01/2026 15:42

And do you have a relationship with them

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zingally · 18/01/2026 11:34

I don't, but my oldest friend does.

My friend (A) and her little brother (C) was born as a result of a second marriage for both parents. Mum was previously childless (her marriage hadn't lasted long), and dad had 2 children. A boy (E), who was about 11 when they got together, and a girl (G) who was about 7.

My friend has a good relationship with her half-sister G. G was interested in her new siblings, and saw quite a lot of them as children.

The half-brother E hasn't really had any involvement with my friend since she was about 9.

I suspect half the issue was that A and C grew up very rurally on the maternal grandparents farm. The half-sister loved animals and the rural life, and so was happy to visit. The half-brother had zero interest in rural life, farms or animals. He didn't want to spend his contact time with dad stuck on a farm in literally the middle of nowhere. He wanted to be where his mum lived - the city. So as soon as he was old enough to express a preference (which came very soon, as he was 11 when the relationship got going), he just stopped coming.

My friend is 40 now and has close to zero contact with her half-brother. They are pretty much birthday and christmas card only. He's never met her children, who are 13 and 11.
Her younger brother C is 38, and as far as I know, he has no contact with his older half-brother.

As far as I know, there was never any big falling out. It was just the age difference, and the difference in preferred lifestyle, was too great.

Bboy1234 · 18/01/2026 10:53

My brother I am close to (same mum and grew up together)

I never knew my dad and met a half sister as an adult, we have occasional contact but no real relationship - i know of other half sisters but have never met them

notatinydancer · 18/01/2026 10:47

I think this thread shows that it’s never a given siblings will get on or have a relationship, so don’t fret about having a child to give your’s a sibling.
I don’t have any half siblings.

CarrieMoonbeams · 18/01/2026 10:47

Very probably, going by a very angry phone call that I overheard when I was a child when my dad didn't know I was in the house. I didn't understand at the time (and there was no way I could have asked him - he was a very violent unpredictable man) but from his side of the conversation I'm guessing that one of his many OW was pregnant.

It's the main reason I will never do an Ancestry DNA test, because I don't want to know. It's sad though if there is a half sibling of mine out there, but tbh he wasn't a dad to be proud of so it wouldn't be one of those nice Long Lost Family type of situations.

TheChosenTwo · 18/01/2026 10:43

My brother and sister are actually half siblings but I’ve always just seen of us all as brother and sister, always forget we don’t share a dad. Brother and I were raised by my dad (brothers dad disappeared before he was born) and my sister came along later but to me they are just my brother and sister.
my dad has an equal relationship to me as he does my brother despite not being his biological dad. As much as I think my dad is a twat I’ve always respected that he committed to being my brothers dad and maintained that even after he and my mum separated. We used to go and stay at his during his contact times and I never knew my brother had a different dad until I was well into my teens.

Sixpence39 · 18/01/2026 10:40

RitaIncognita · 17/01/2026 18:05

Possibly, but my two half-siblings are from my dad, and we are close. I did spend quite a bit of time with my dad (and them) growing up, though.

Same here. Dad made a huge effort for us to all be close - even when they were babies he'd show them photos of us and get them all excited before a visit. He still pays for us all to go away for the occasional "sisters weekend" together even now we're adults and they are late teens.

Sixpence39 · 18/01/2026 10:36

One 'full' sister and two 'half'. But we're all just sisters - would never use the word half as to us it implies half the love or something. Closer to 'full' as grew up in same house and much closer in age, so shared a lot of experiences. But we're all close and very affectionate, which I'm so grateful for as I didn't have a good relationship with their mum for a loooong time.

Porkpiesarespicy · 18/01/2026 10:32

8 in total from both parents and I only speak to two - brothers, we are in regular contact phone visits etc as sibling would I have never seen them as half - any of them.

Xmasfeeling · 18/01/2026 10:21

1 from my Dad but I dont consider him a sibling really. No relationship, distance and 20 year age gap.

I lost my only brother 18 months ago which devastated me so now I feel like i don't have any. They didnt have a relationship either.

asco · 18/01/2026 10:18

My Dad has twins, boy and girl, they are not yet 3 and the absolute love of my life, they are the cutest and funniest pair of whirlwinds ever. They live a couple of hours away so only see them every 2 weeks at the moment but are moving to within half an hour this year so will see them all the time. I see them as and refer to them as my brother and sister
When DH and I met I had 2 and he had 1, they've all known each other since being babies/toddlers and there are only months between one of mine and his, we also have two together and they all refer to each other as brothers, we've never used the terms step or half in relation to the children or us.

BonneMamanAbricot · 18/01/2026 10:11

Yes and class them as 'full' siblings. Also have two step siblings who don't see us as family and want nothing to do with us (their choice)

LBB2020 · 18/01/2026 10:05

Yes, we all share the same mum and I never refer to them as “half”. We aren’t super close but I think that is more due to there being a large age gap between us (I moved out when they were still very young). We do see and message each other just not regularly. I see one of them more often as they aren’t currently working so easier to arrange meet ups (always with our mum there too)

QuietDreams · 18/01/2026 09:59

My father has kids with 2 other women, my mother has kids with another man. I’m not interested in a relationship with any of them. I had to put up with them when I was a child and that was enough. So called blended families…bleugh.

Perplexin · 18/01/2026 09:34

Vibted7777 · 17/01/2026 22:55

What made you not want to talk to her

She and I share another sister (my full sister, her half) and she warned me not too.

My full sister did have a relationship with her but she was nothing but trouble so she cut her off and went NC.

TheFireHorse · 18/01/2026 00:26

I have one (that I know of) same age as my grandchild.

Only met them once, at my dad's funeral, actually our dad's funeral.

Poor thing.

Dr13Hadley · 17/01/2026 23:54

I have a half brother who is 14 years younger than me. He’s 30 now and lives about an hour away from
us with his girlfriend. I see him probably 4-5 times a year and although we didn’t ever live together we are close. We are very similar in personality and have the same sense of humour. He has me in tears with laughter. My kids and husband love him too. He’s my only sibling and I’m his so we cherish that. I’m lucky to have him 😊

Anononony · 17/01/2026 23:38

Yes, me and my brother have different bio dads but his (our, i consider him as much mine as his) dad raised me

We get on well, I moved away so we see each other whenever we're back down, our kids adore each other, we mostly communicate via sharing memes/reels otherwise!

I have no idea if my bio dad went on to have more children and have no interest in knowing, I have no contact with any family on that side now

smallsilvercloud · 17/01/2026 23:36

5 half siblings, only stay in touch with one of them.

Fibrous · 17/01/2026 23:36

Yes, I have two of each type, all my mums. I lived with all of them and have a relationship with all of them. Closest to my nearest sibling in age, though, who is a full sibling, but that’s just because the others are all a bit crazy.

whiteroseredrose · 17/01/2026 23:34

Yes. To me, they are my siblings.

Sarkykitty · 17/01/2026 23:33

I have a slightly older full sibling and we don’t speak, they were my biggest bully from when I can remember and didn’t stop until my mum died- they are toxic (towards the whole family not just me) I also have a younger step sibling who is honestly the most lovely person and always has my back and if they didn’t live far away now we would spend so much time together and also we share a half sibling who I’m very grateful for they are a wonderful person too and I love them dearly and feel so happy and lucky I got my 2 younger siblings.
my 2 younger children are half siblings with my eldest too and they are as close as ever.

Oricolt · 17/01/2026 23:26

I have a strong relationship with the half siblings who I shared a home with growing up. They're just my siblings - no difference whatsoever between halfs and fulls.

I have no relationship at all with the half siblings I didn't share a home with.

OnlyFrench · 17/01/2026 23:24

Yes, big age gaps but grew up together. I adore them. Full sibling, not so much!

Runningoutofpatiencefucksandmoney · 17/01/2026 23:22

Yes 4. And none of us get on.

My DD is one of 7 half sibs and gets on with all of them

Itsallinyourhead2022 · 17/01/2026 23:07

Two half brothers and two half sister and one full sister. My dad was our common parent and we are all extremely close. My dad died just over four years ago and we’ve all just carried on as normal. Always referred each other as brothers and sisters.

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