W is certainly feeling some guilt over this and is trying to play the "good girl" in this by appealing to the decency in you. Do you see how wrong-headed this line of logic is??!! She's the one that BROKE up the family with her A and S12 has every perfect right to feel anger toward her.
S12 and W's relationship is theirs to own. It is good of you to continue staying out of the way and let them forge a R on their own.
How about sending a simple response to W:
Thank you for sharing your thoughts. I am staying out of your relationship with S12 since it is for you guys to figure out together. You need to understand that S12 is entitled to his feelings. It is essential that we respect them and allow him the space to have them. See you tomorrow. Take care.
