My two grandmothers disliked each other and were always icily polite whenever they met! They shared the same first name, and punctiliously addressed each other by it, although both had nicknames they could have used. We children called them by different names (one had a family nickname that everybody in every generation used, including the great-grandchildren, as they came along), so there was no confusion there.
My grandsons see less of their other grandparents than they do of their Granda and me, as the others live some distance away. With the predictable result that Granny and Grandad spoil them more than Gran and Granda do - but I like to feel they actually know us better. I hope they like their other grandparents, though - they are due to spend a week with them at the start of the summer holidays, so they'll have need to!
Something for new Mum ........
Are You Finding the Hot Weather is Making you Short Tempered?






