Certainly not jumping into this one! But did want to say that we are definitely not the first generation to have to cope with lots of caring.
Different families have had different experiences, but in my family mothers worked as and when they could: childcare was done by grannies, sisters, older children, neighbours. This was a working class area, rural, with a lot of (poorly paid) employment for men and women, but was also (decent food, good air) an area with some longevity. For instance, my grandmother was not exceptional, but a typical example: she cared for her own children whilst cooking & cleaning for her grandmother, then cared for me 3 afternoons a week whilst nursing her mother, all whilst running a small shop.
Of course, different experiences lead to different expectations, and the only thing to do is to talk about it.