It tells me that the OP is hard working and motivated, and is shocked by the way her parents are behaving, not some kind of psychopathic oligarch! It also tells me that she is most likely genuinely upset by observing her parents behaviour, and that this is more important to her than money. Otherwise, her thread would have been based on her boasting about how hard she has worked and how much she has achieved, rather than describing her parents' behaviour.
I have never disputed that the family works hard. That was an allegation/speculation posted by others and attributed to me by JohnFarleysRuskin.
But, OPs question is whether she is entitled. None of us are entitled to anything owned by others. Entitlement and greed are destroying the fabric of society, and it is all very well for people to say, "Oh well, those people are not entitled to this, or that, but I'm entitled to this because in my case it is different." Unless you have a legal right under Common Law or a contract with an individual or an organisations, feeling aggrieved that someone will not give you stuff for free, just because they have it and you feel your entitled to is, is greed plain and simple.
Yet, political correctness says we must all say, "There, there, deary. This is bad. It's awful that they wont give you free shit to add to your already self professed pile of wealth." instead of just posting the truth. It is greed. Both she and her parents are greedy souls, and she is on here bitching that they aren't giving her a slice of it, and looking for solidarity among others so that she can justify her bitterness and her resentment.
I don't think there is anything wrong with observing something and forming an opinion on it, and acting accordingly. I mean, where would you draw the line if all forming of opinions were bad?
Neither do I, but the person who is being mentally fucked up by their whole prema donna dance, is OP, who is talking about cutting her parents off and cancelling Christmas rights. She is taking her greed and resentment and inflicting it on her children. "No, Granny and Grandad can't see you anymore, because they're greedy fucks and they won't give us any of your Great Grandad's estate."
We all have the right to view the world as we please, and clearly OP believes she is entitled to judge her parents and take action against them, despite them (as far as we have been told so far) never having harmed, nor indicating that they would harm, her family unit. She feels entitled to punish her Grandparents and her children for what she believes is an entitlement to money.
She harps on about it being the principle, but this is all about money, greed, jealousy, envy, hypocrisy. Clearly someone who has no idea of the basic failings in life, that she prospers quite considerably, but is still able to squeeze a good amount of destructive habits into her life.