Unbalanced Inheritance Division

She may well be, but ime there's usually a reason why parents favour 1 child over another (eg personality clashes, addiction etc).
Not that I'm saying these reasons are the case here obviously.

It’s not your sister’s fault though is it?

My parents have always favoured my sister so I could see something like this happening to me but it’s not something I can control so I don’t worry about it.

Sister may just be the golden child.

My parents offered me a bigger slice than my siblings as I’ve done all the care. I just said don’t be ridiculous. They said they might do it regardless I pointed out I would just even it out so there was no point wasting legal fees on someone that could be so easily undone.

A friend this happened to the majority went to her brother, he simply evened it up himself. Really depends on the person.

I say keeps the money she loses her sister.

There has to be some reason your parents have chosen to do such an unequal split OP. You just haven't found it yet.

It's this. Your parents won't have made a random choice as to how to do the split. There will be some reasoning behind it. Unfortunatly, you may never know what. Your sister may know. She may think there's a very good reason not to tell you. Or she may not know. She may need the money, and again, she might not want to tell you that. But it's going to be up to you to decide if that's enough reason to cut contact with her.

It seems very unfair if there are no special circumstances to consider e.g. disability/ long term chronic illness.

Is there a suspicion that your sister coerced your parents?

You don’t need anybody’s permission to cut contact. It won’t change the inheritance but it might mean that you’re not regularly reminded of the hurt caused.

So you have no idea why your parents did it? Or you know but don't think it's relevant?

An awful decision. And it IS the sister's fault as she could easily arrange a deed of variation. When my father died he had cut out both my brothers due to a fall out. We 3 sisters organised a deed of variation that everything was split 5 ways. The sister is being very cruel & I would find it hard to get past.

There is obviously more to their decision but unfortunately you don’t know it so can’t make a call as to whether their reasoning would change the fact that you are upset. Nothing you can do but let it go, your sister doesn’t have to balance anything if she doesn’t want to (and in the nicest possibly way it’s easy to say “I would” when you don’t have to make that decision). Up to you whether or not you choose to keep a relationship with your sister or not.

My dad was a little... unhinged? Would say about cutting people out wills etc as a threat. We siblings agreed beforehand whatever happened with the will, we would split equally, even the one who nobody had seen for over 20 years. I like to think we would've kept that promise (but I suspect not with 2 of my siblings) but as it turned out we didn't need to.

I am aware though that money makes some people greedy and tossers. Your sister is being a bit of a tosser but bottom line is you have no right to the money. Sorry OP, I understand very much that it hurts.

I'm sorry but there is something...

Perhaps you genuinely don't know what it is. Maybe your sister does...

But no one does this randomly, usually it is because they perceive some form of unfairness or injustice of wrongdoing.

It's easier to say you'll do the "right thing" when you don't have to make the decision.

If it had been the other way round you may have thought "she is wealthier than me by a large margin so I will keep the split".

I don't think this sorts of decisions happen in isolation. Your parents must have some reason for why they did what they did, I doubt very much that the decision was completely random.

This happened to a family member of mine. The siblings split it equally. One wanted to stick to the will, the other wanted to split it equally but they both did in the end.

I’m very sorry @Stilson given your clarification that’s really tough. And while it wasn’t your sister’s decision, she could have made it right by splitting the money with you equally. I don’t blame you if you go NC as it will be very hard to get over it, especially if she’s so much better off even before the inheritance.

edited for typo

Was she rewarded for “doing better” in life?

My parents help my sister financially much more than me (always have) as she has a bigger house, better job, nice car, takes holidays. Therefore she “needs the money” more than us…

Did none of your siblings think that it was a bit off for your parents to do that? Or a bit selfish of your brother to just keep it all?

Well there's back story here somewhere isn't there? Decisions like that between two siblings of the same sex don't usually come out of the blue.

@Grollsch
No, believe it or not, there was no particular reason.

It does seem unfair @Stilson but without background we can’t say. Were there reasons given? Did they leave any explanatory letters (expression of wish) that clarify? For example (not in your case) they might say “child B has no money and their career will never pay well so we have left them a bigger share”.

If your sister has always been favoured, you would likely have hoped to be treated more fairly but would have expected this.

But if it has come out of the blue, I would be in a state of shock and - being unable to find out why - my mind would be in a whirl as to what the reason is.

If I knew I’d received a bigger share without good reason, I’d definitely be looking to even things up a bit.

Many years ago one niece was left out of the inheritance from her uncle because he'd witnessed her arguing with her mother once (so he said! )
When they read the will, her brothers just laughed and shared the money out equally. (They never told her what the will had said of course.)
This is what good people do.

I know a family of 3 children, all now well into middle age.

Two of them have average or below average incomes, one of those has a disabling health issue which meant he hasn't been able to work since he was in his early 40s.

The third is loaded. They live in a >£1m house, have retired early on large private pensions, have additional investment income and sold their business for close to £500k.

Their father intends to leave 40% of his estate to the first two siblings and 20% to the very well off one.

This seems entirely fair to me, especially given that the only child of the third sibling inherited a very large trust fund from his maternal GM, as he was the only grandchild at the time of her death.

It sounds incredibly hurtful.

Is there any backstory at all though? Or anything that might have given you an inclination this was going to happen before it did?

I suspect that by keeping it brief that you're leaving out potential reasons hy this may have occured. You're giving no details. At first sight, yes, it's obviously unfair, but there could be a lot of information left out that may help explain it.