Speaking as the "kid", I can't imagine having not provided the care for my parents in their home before they passed. However, I was able to do so because I lived just a few blocks away. Also, my brother and sis-in-law equally helped so it wasn't all on one person.
Speaking as a single adult with no kids, I can't imagine asking nor do I expect my nephews to provide for my care when I am older. I would like to have in-home care and live in my own house til the end. But, when it actually comes to that point in life, my family will most likely be involved in providing at least some of my care. As morbid as it sounds, as soon as I am unable to live independently, I hope that I suddenly drop dead. I've lived alone most of my entire adult life and don't think I'd be happy living any other way.