Chatty, we went through a similar experience with my son and DIL. It's the initial joy, then sadness when a miscarriage happens and I too grieved for grandchildren I thought we would never see.
It got even harder when my friends were always talking about their wonderful grandchildren, but I put a smile on my face and looked at all their photos. it wasn't their fault that I was sad.
It has such a terrible effect emotionally on all the family. My DIL had a nervous breakdown, as she blamed herself for not becoming pregnant. It was so hard finding ways to support her.
They decided to have one last try after thirteen years of trying and we now have our darling granddaughter.
The hardest thing of all for me was eventually finding out that my son had inherited a gene from me, which causes male infertility. I have spent many hours beating myself up about this, but can't talk to anyone about this. This is the first time I have ever spoken about it.
I found my son and DIL didn't want to talk about it, as it was too painful for them, but they knew that DH and I were there if they needed us.
Chatty,