I'm sure she is Huck. From what I have learned about you here at FR, you are a fine man.
It is my fervent wish that my 5 Grandkids speak of me as you speak of your Grandma. That in itself would give meaning to my life.
Well, all I can tell you, from a grandkids perspective, is it's one of those cases where you do the work now and it pays off later. At least, that's how it was with my Grandma, in part because the burden fell to her to provide me some discipline and behavioral training (translation: the belt and the switch, sometimes cornbread and milk for supper). But it wasn't just punishment. It was consistent--extremely consistent--treatment and instruction. I didn't always appreciate it at the time, but later on I did. Lucklily, that was while she was still alive. I was able to spend good long hours with her as an adult, after I had finally grown up, and really enjoy her company.
For you it might be a different dynamic. You might not have to play the heavy. You might be able to just play games and tell stories, etc. Anyway, I hope your grandkids appreciate you. I am sure you're a great granddad. And thanks for the nice compliment. You are very kind.