My mum isn't anywhere near this stage yet but it was recently discussed with my siblings as we the topic came up in conversation.
This could turn into an epic post so I will do my best to disclose important info without waffling or drop feeding.
My mum has many faults. Soft and gentle in nature (and thus everything is constantly glossed over or shrugged off) but her decisions in life have been selfish and directly affected our lives deeply. The worst example of this is being aware of the sexual abuse at the hands of my father and not protecting me. She simply cannot be alone and although I believe heavily emotionally abused and somewhat brainwashed (yes really- he was a Truely believed he was gods messenger) she did not help me. Subsequent relationships include emotional abuse from her partners towards my younger siblings, etc.
She lacks tact and sometimes just common sense. I have created much distance between us and our relationship is strained though I do not think she realises this. Needless to say no trust.
Despite us all being very aware (and openly discuss her faults between us) my elder siblings are very close to her.
They feel that should mum ever need taking in and cared for, it is our duty as her children 'whom she has birthed and raised' and we should 'pay it back' ..no homes etc.
Whilst I don't like the idea of mum going into a home, i feel sick to the pit of my stomach at the idea of handing my life over to be her sole carer in her old age after everything. I deeply wish nc was an option and I grieve our relationship- or what I wish it was daily.
I kept quiet and brushed it off by making light hearted jokes but I then spent the entire night up worrying. As I say this is not an imminent situation but I've been left deeply concerned about my lack of.. care or loyalty to her, when despite all my siblings seem to be queuing up to repay their debt of being bought into the world -and then left to fend for themselves-- 
But she is my mum. . Aibu? And what the fuck it fuck do I do in 10 years when I'm faced with this possibility?