Maybe the stress you saw on your son's face was because he was afraid of your reaction?
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Because I don't want to cause him stress over visiting, I don't react negatively ever. If I had ever gotten mad or upset, I would agree with you 100%.
You do not have to get 'mad' or show that you are very 'upset'....
That is just the thing...
Your feelings and expectations in your relationship with your son are there, whether they are strongly verbalized or not.
You need to step back, emotionally, loosen those apron strings... Be happy that they are there, instead of being all upset and posting here because it isn't enough...
They are adults.. they have other family and friends to visit.
Your son has a demanding position that takes away from his time with his wife, and his family, and with her family, and with their friends, etc.
I see that you are a good person, and you mean well, and I am not trying to be accusatory, but I really am afraid that you and your son have not completely cut-the-cord.
I truly think that this is what is adding so much angst to this whole issue.