"I have a feeling that sadly she may feel giving you access will lead to your son seeing more of him and it sounds like she doesn't want that."
Jishere may be right about this, Elaine. Plus, XDIL may think it's up to your DS to make sure you get time w/ GS. So I think your only recourse is to focus on whatever time you get to share w/ DS. Hopefully, this will increase in time. So sorry about this, but glad you seem to be acting reasonable about it.
Sally, I feel for you, as well. I don't think XDIL and her new chap meant to hurt you though. It's just that their needs changed. Perhaps it's a little selfish of them not to include you in the kids' lives, anyhow, especially since the kids had a relationship w/ you. But if it's any comfort, it may just not fit their current schedule. It's kind of you not to ask DS to share his limited visitation time w/ you, but perhaps he could, say, once a month? That wouldn't be the same as what you were used to, but maybe better than nothing?