Ok, so the kids know reality...and especially since they are grown, it is not your responsibility to intervene...
I would have said something like this: "W, I am sure you and S will work out your relationship"
-It puts the responsibility back where it belongs, with W and S. -YOU are not seen as judgmental, controlling, or anything like that...maybe that would be different than before, idk.
To be honest, I would have THOUGHT what you did, but this far into my sitch, I finally learned how to deploy a filter between brain and mouth..it did take me quite a lot of time and slips though....
T^2
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm