If your relative is still verbal and demanding and exerting their will, they’re unlikely to be in the final stages of life, OP. As others have said, the only way to get an intervention is to drop the rope, which means social services have to get involved. They’ll be more than happy to leave it to relatives if you all continue providing round the clock support.
When it comes to end of life, IM(bitter)E, it was like getting blood from a stone trying to get any medical professional to explicitly say my mother was dying. Although she wasn’t old, she had dementia, a fall and (whilst hospitalised) a stroke. She had spent weeks in hospital when they suddenly announced we had 48 hours to make alternative arrangements as they needed the bed.
We were told that the physios and speech therapists had ‘done as much as they could’ and that we ‘probably wouldn’t see much further improvement’, amongst other vague statements. When I asked outright what the prognosis was, we just got a lot of head tilts and repetition of what they’d already said, no actual information, so we had no idea how to approach the issue of her ongoing care. We didn’t know if she had weeks, months or years left - it felt like we were blindly trying to divine the meaning in all these vague phrases and no one wanted to actually tell us what was going on. It was quite unbelievable.
In the end DSis and I doorstepped a consultant on her morning rounds, who look at mum’s notes and cheerfully told us ‘you’ll be doing well if she lasts three weeks’, which was a blessed relief, and the first and only indication that we needed to be looking at palliative care. She died seven days later.
Giving nothing but stupid platitudes is outrageous, when you think about it. Medical professionals know when someone is on the way out, so trying to obscure and skirt around the issue is unhelpful in the extreme. Being honest and framing expectations allows the family to use the time properly, to say their goodbyes, make appropriate arrangements, call other close relatives - instead of wasting all their energy trying to decode gnomic fucking pronouncements.
Good luck, OP. I’m so sorry you’re in this horrible situation.