<human>: Could you distill the essence of the text into 1-3 sentences?

As the title suggests, I'm looking for advice on how best to be supportive of my parents as they care for my elderly, and rapidly ailing grandparents.

All four of my grandparents are still alive, but have varying levels of health. Two have various alzheimers/dementia style issues, the other two are just getting older very quickly. They live in a different country than my parents/myself. My parents are doing their best to support them - they visit very frequently, have arranged in-home care, have lined up more local relatives to check-in on the grandparents daily, etc.

All that said, it's clearly taking a huge toll on my parents. I've observed they are really tired/sad every time they get back from seeing the grandparents, sound really frustrated/cranky whenever talking about what the grandparents are going through, and generally more short-tempered all-the-time.

I have no idea how to support my parents through this. Right now, I'm doing my best to call/speak with my parents often and be supportive about this. But, honestly, it doesn't feel enough and is a bit frustrating to not be able to make this 'better' for them.

Any ideas? What can I do do to be supportive of my parents? If you experienced something similar, what did you do in the situation?
<bot>: my grandparents are of varying levels of health and need a lot of help/support from my parents, parents are getting exhausted/frustrated; how can I be supportive for my parents?