Got to add my thoughts. I'm in my seventies, obviously jogging on rather fast towards the Grim Reaper. I have two middle aged children. My daughter lives very near - six or seven minutes in the car. Son further away, an hour or so driving. So obviously I see much more of daughter and her family. And when I was seriously ill with pneumonia (twice) daughter was doing a lot of caring, and son came up when he could.
I wouldn't dream of thinking 'ah, daughter does more, so she gets more when I shuffle off ...' And neither of my kids would ever think I should - I can confidently say it would never cross their minds.
As for thinking it's not on to discuss what happens when a parent dies, as some do - I disagree. I've given my two children a document titled 'What to do when I'm gone'. It tells them all they need to know to sort out stuff when I die, from my disposal (burial rather than cremation) to where everything is in my files - bank, savings, insurance, utilities, council tax, pension etc. etc. etc. What to do with my cat, should she outlive me. Where my Will is, and my Power of Attorney (with my solicitor, who is also a family member). There is also a list detailing, with photographs, who has what when it comes to my jewellery and watches (all agreed with my kids). I've also made a list of people to tell when I die - names, emails, tel. nos. Every year I update this document as necessary - changed insurers, for example, or added more people to tell (or taken off those who've died before me!)
All in all, the entire document runs to 15 pages. To make it easier to read, I've colour coded the different sections and I actually quite enjoy producing the thing, not feeling depressed or miserable at all.
In NO way do my children, or their spouses, think I am being 'morbid'. After all, we're all going to die one day - I am a realist. Instead, my kids are grateful that I've made it as simple as I can for them to sort out when I go. They've seen it themselves, with friends who have had a god almighty mess to untangle, especially when one adds relatives to the mix who feel aggrieved over being left out, or not left what they'd expected etc.
I do understand, though, that for many people, any mention that they might not be around for ever is highly distressing. Maybe I'm a bit of a cold realist, but I hate the idea of leaving a mess when I die that causes the people I love best in the world a lot work and distress as they try to unravel it all.
I think the OP in this thread sounds a little bitter, for some reason, with her term 'fawning' to describe her sisters. But give her the benefit of the doubt - maybe she was feeling a bit pissed off when she wrote her post.
As a matter of interest, if OP's parents lived in, say, France, according to Napoleonic Law, children CAN'T be disinherited. Think this applies to other European countries too, but can't be bothered to Google it. Anyway, in the UK, OP's parents can leave it to the three sisters, the two sisters, the Donkey Sanctuary, the Cats' Home, a political party, or any bloody thing they like. Or not leave a Will at all (which would actually work in the OP's favour!) But if the parents leave a Will but leave out OPL, OP can't do a thing about it, unless she can prove that her parents were in some way supporting her at the time of their death (though other wiser legally minded MNers will know more about this).