I know that some employers offer 5 days 'carers' leave' as I worked in a multi-disciplinary team where some had it (depending on their employer) and some (me) didn't.
I finally cut my working hours to care for my parents. I wasn't exactly bitter, but I did think that at all points I (& DH) had borne the burden of care ourselves, as I had worked casually or part-time whilst my children were small, as their dad worked very long and unpredictable hours.
We were fortunate in having a good income, and fairly modest tastes, so my earnings weren't an issue. I know that my own kids won't be able to do the same, so my savings will pay for care.
And I am very sympathetic to those employers who struggle to help carers. We sometimes got in the mad situation where, as I was the 'at home mum', my DH would cover the work of colleagues whose own partners refused to take time off work for sick children. I was so cross with one of them that at a 'do' I told him that I was functioning as his wife. He went to work without thinking about his kids, his wife took time off to look after them, my DH covered her work during his days off, and could do so because I took up the slack. He spluttered that I didn't have a job anyway, and I said there was one waiting for me when I could go back to it.
I too felt, once I went back to work, that I covered for colleagues taking time off 'because my children are older now'. However, I tried to do it with good grace, knowing that I have been fortunate.