S5 knows pretty much the same - that W lives in one place and I in another. But he's very observant, notices that W is "sad" or "angry" and he is mourning that "our family is broken apart." When W was going full throttle toward D in Nov., she got all these pop-psych books on D that paint it as a fun, wonderful adventure, but S5 recoiled from it, feeling his own sorrow about W and I being split it.
As I was the only parent willing to talk to him about his sadness, he learned to come to me to talk about his feelings. I have kept a semi-neutral stance, letting him know that I will always love him, and will try to be available to him as much as I can, and that I love W, and I have helped him to learn how to pray/talk to God directly about his wish for his family to "get back together."
I guess I take a "we will see" approach, and I think W has backed down to a neutral stance with him as well.
