Goodness me, Claennis, and we're self-righteous? At least none of us has SHOUTED and MADE PRONOUNCEMENTS based on absolutely no evidence about the devastating damage done to a child who hasn't seen a grandparents for 8 months.
I saw my grandparents once or twice a year for visits of ten days or so, starting when my grandfather retired: I was four. I don't think they ever visited before that, due to his unpredictable work schedule. Did I love them? Oh, my goodness, you have no idea! Did they love me and my brothers? Tremendously! They missed out on that UNCONSCIONABLY brief deadline you seemed to think is a bare minimum for seeing their grandchildren. (They had 9--they'd have been spread thin dashing across the entire USA if they had spent our babyhoods trying to see all of us frequently.) They missed out on seeing us once or twice a year when we were tiny, though my mother wrote often and sent pictures--and got lovely, newsy letters back. And yet as teenagers and adults, when we all lived in the same town, my brothers and I and any visiting cousins never missed a family gathering they were going to take part in because we just plain enjoyed seeing them. They were welcoming. But then my grandparents weren't pushy, didn't make demands, didn't criticize my parents, criticized us very, very rarely, gently and minimally, didn't think boundaries were there to be broken, were easy-going and were pleasant to be around. That's ideal for grandparents, no matter how old the grandchildren are.