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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

OP posts:
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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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