G.B.
As a grandparent raising grandchildren I can tell you it's completely different for me than it is for you even if the kids are exactly the same.
We do stuff, we don't yell about homework, I don't worry so much about the day to day stuff than a regular parent does. I know that time is limited, kids are going to grow up and get there no matter what I do wrong or right. They need to remember the closeness, the compassion, truthfulness, hugs, having their back, looking them straight in the eye and saying that something isn't right and here's why you shouldn't do it, pushing them a bit then supporting them enough to help them succeed, and to simply enjoy them.
I am happy to say I love having my grand kids living with me and that they are the most precious things in my life.
I treat the kids with respect, I listen to them, I take what they say into consideration, I don't automatically say NO because that's what a mom should do, I let them do more stuff because it's just fun.