After my son was born all and sundry turned up to see me in hospital. I didn't think they had 'a right' to do so but I was glad they loved me and my baby enough to bother. I certainly didn't think I needed to invite them. And after the birth of my daughter at home it was even more of an open house, and I loved it despite the fact that I had lost pints of blood and couldn't even pick my baby up for about a week.
I don't think many people on this forum would claim that grandparents have 'rights' but nor do daughters, sons, daughters-in-law, sons-in-law etc have any right to have parents and in laws that love them, gladly spend money on their children, give up their retirement time to child mind, travel across the country to see them and offer their help. It's called love, and being a family, and passing on that message to the next generation. Of course if grandparents are toxic, or over demanding, or unreasonable in some way then boundaries have to be drawn, but otherwise why can't we just enjoy one another while we have them. Many of those people who came to see me and my babies are now dead, and what I wouldn't give to be able to share one more day of that love. Thank goodness my children seem to feel the same.