Re: Sem613: We did the same thing. We visited every Sunday. Brought the kids over for a quick visit. We sent them notes the kids made, cute things to hang on the fridge.
We did this for 4 years. It had no impact. I am truly happy you were able to rebuild a relationship with your grandparents.
Unfortunately, until my children were young adults and suddenly became interesting to their grandparents, they had little or no contact with them. No hugs, no birthday calls, gifts, etc.
It broke my heart.