Well, Chilledlady, what exactly does "cut them loose" mean?
Have you been trying to hang on to them, pushing for more visits to no avail and nursing hurt and angry feelings between visits? And now you've decided to sort of "punish" them by cutting back contact as much as possible - no skype, no facetime, no letters, etc. except when you make plans to "meet up?"
Or do you just mean that you're letting go of the hurt and anger and just going to enjoy your life as is, including the time you do get to spend with your son and daughter and their families?
The former sounds vengeful and mean. The latter sounds wise and beautiful. I hope it is the latter.
I can't join you in either one, really, because, lucky for me, my dd and gc live within reasonable distance. But if they were far away, I would definitely join you in the latter idea. In fact, even now, I try not to focus too much on them, to understand that they have busy lives of their own and dh and I need to have and enjoy one as well. So again, if giving everybody the space they need is what you are talking about, I'm with you!