Found half sister on ansestory my mum is livid. WDID??

[Secretlysurviving]

My dad had a kid when he was a kid. Back then no DNA tests were about and to be honest he never knew!! There were whisper and rumours but they were denied by my sisters mother!!
FOURTY YEARS later we join ansestory and we find one another. Since then we met up my dad met her but my mum is furious.
She has fallen out with my dad because he met her and she's fallen out with me for meeting up with my sister too.
My mum and dad are married and built a life together with many kids. Been together since late teens/early 20 and now almost 70 so I get why my mum is hurt but I'm annoyed she's making me feel like I am having an affair or something!
I like my sister, we get on but it's causing drama for my mother and father. I didn't tell my mum I went to see her last week but she found out somehow and now point blank refuses to acknowledge me. WTF do I do??

I think the sister is older than op.
Born before the parents met or while they were v young and before marriage. I think it is an older sister.

OP would have mentioned if it was a cheating situation, that would be a main factor in the story.

And just trample all over her mothers’ feelings in favour of someone whose only connection is DNA ? You sound lovely by the way.

@Rosscameasdoody and so do you. Not, obviously.

It isn't your fault that your dad had an affair OP. Carry on seeing your sister and tell your mum that what happened in the past is not your issue, and you're not taking blame for it. That you can understand why she's sad about it, but that your sister is here now. If she cuts you out, so be it. I expect she'll come round.

The lack of empathy for OP’s mother is astounding. I don’t think it makes me unlovely to be able to see things from the mothers’ point of view - especially if this child was as a result of an affair, which is possible from the unclear timelines. No - it’s not OP’s fault that her dad had an affair. But to ignore the feelings of a mother who raised her and cared for her, in favour of someone who in reality, at present at least, has no more of a connection than DNA, and just barge ahead regardless isn’t ideal - there’s a reason the Ancestry site offers counselling and situations such as the OP’s are a perfect example. I’m not for a moment suggesting that OP shouldn’t pursue a relationship with her half sister, simply that she and her dad have a connection to this woman that her mother can’t share in, and they should respect her feelings and find a kinder way to go about things other than the outright nasty confrontation that the poster I was replying to suggested.

OP has done a runner.

I get the impression from 'when he was a kid' and mum and dad have been together since late teens early 20s would suggest the first happened before her mum and dad got together.

Sometimes you leave people to their feelings and their thoughts and they have to carry themselves

Just wondering what your other siblings say about the new 1/2 sister.