Poppyred
Callistemon21
because she obviously wants things kept private
But posted it on the internet.
Exactly! And isn’t coming back to explain herself by all accounts.
TBH, I think these kinds of 'issues' (for want of a better word) being posted under AIBU where the poster cannot - or is reluctant to - give detailed information are always going to raise more questions rather than helpful replies.
We don't know what the brother's wishes were, we don't know why the OP's father changed his Will, or what was in the original, nor why the nieces expected more - on what basis... and we don't know why the rest of the estate was left to the OP. All we know is that the two nieces are not happy and have asked to see a copy of the Will.
The OP herself, judging by the tone of her post, appears to think the nieces are being unreasonable and is maybe hoping we will agree with her. But, not knowing the family dynamics nor any of the facts - how can we possibly say?
I think she'd be better served by seeking legal advice on the matter where she can discuss the matter privately in full and in confidence, and not solicit opinions from GN'ers who are simply going to respond to the limited information according to their own bias and experiences.