FlyingSolo, you must be so hurt. I couldn't bear to be in your situation.
I think all families are different and it's different when it's not your daughter.
I was at the hospital when my DIL had her C section at my son's request, as her own parents couldn't be bothered to be there, despite being asked and told it was a "touch and go" situation.
My son just just needed moral support. .
We saw our DGD the following day in hospital, as my daughter in law had been too unwell to have visitors after delivery. We would never have forced ourselves on them, but it was my son and DIL's wish that we came to see the new baby as soon as was practical.
I spent a lot of time after the birth, helping my DIL, as she was still very unwell and unable to look after the wee one.
Once again her own parents couldn't be bothered, despite living ten just minutes away.
I too realise how lucky I am, my other children are also very much involved in our wee granddaughter's life.
My friends are in a similar position with their grandchildren. Naivelly I may have taken it for granted that all families are like this.
However, I suspect that if my other son has a child, I will hardly ever see the baby. My future DIL is a very forceful person, who demands that my son spends most of his time with her and her extended family. That's his choice and I have to accept that.
They are probably more fun than us anyway.! 
FlyingSolo I hope your situation improves. 