This is a great place to rant. I think you're living what they call the "sandwich" years...caught between the pull of elderly parents and the demands from your children with their children. I've never had to deal with any of it, so in some ways, for me, the grass is greener on your side of the fence...but I can empathize with you feeling like you're in a tug of war. I'd say that the time to look after you is NOW...somehow find a way to carve out space and time to pursue YOUR interests and desires NOW. Don't wait. I can tell you stories about people who waited...

There's got to be a way to set aside time in your day/week/life for activities and things that will make you feel like you're less tugged on and more empowered to choose which demands you're going to meet and when.

But there are others here with more experience with that sandwich dilemma...perhaps they'll be by with more life experience and wisdom. But know that we ALL cherish the freedom to rant here, so welcome!!
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)