I'm not raising any of my grandchildren, and it wouldn't be an easy task, especially with my health problems, but would fight for them to come live with me over going to strangers, if something happened.
My DH and I are blessed to have good SIL's and their parents, or grands, 'other' grandparents are great ppl too.
It's the children that benefit from your love, and that is why so many can't say no.
We do things we never thought we would out of love.
(Some situations do make you crazy though.) My best to anyone that got to middle age, had done their job with kids, and then 'forced' to start again.
My hat is off to you :-D