This subject was (is) never an issue for either of our families. On the Luther side of the family, let me tell you once you're "in the family, you are in the family". And that's that! They constantly ask about our birthparents and want to know if there's something they can do to help them in any way or just to do something nice for them to show them how appreciative they are. And if I had to venture to say, I would say the grandparents have bonded more with Gracie than the other grandchildren because of the miraculous way she joined our family.
On my side of the family, the youngest grandchild was 13 when Gracie came along. So, my family was just besides themselves to get their hands on a baby. They just can't get enough of her. I asked my sister to babysit for a couple of hours Saturday afternoon. Her response "only if she can spend the night". Since my father is now deceased and my mother isn't very healthy, my sister has tended to fill the grandparent role on my side of the family and it has been such a wonderful blessing for all of us.