I have been reading up on some other threads here and notice two schools of thought regarding how to treat a WAW/WAS when they make decisions that affect the family, e.g. Separation, moving out, divorce. One is to show support for their actions, while the other is to let them see the reality of their decisions. One example I read is going with the spouse to look for an apartment (and that spouse gave some positive feedback on that action).
In terms which school of thought I want to apply to my situation, I'm leaning towards the latter, i.e. My wife chose to move and take our son there, she shouldn't be asking me to drop our son off at her place, and I shouldn't be saying yes to those requests.