Bunches, I've received some of the same type of comments from my WAW- how she's doing what's best for the kids (no, that would be their parents trying to work things out), how we should continue to be friends (despite the betrayal of an A) and how I've switched up plans without consulting with her (like we should be accommodating to a WAW?).
The mind of a WAW- it's almost like they have set plan of how things will work and as soon as we take a stand for what's best for us, it throws them off their game.
Maybe I'm just speaking from the bitter LBH perspective, but as long as you're not fishing for info, I think you should be able to contact who ever you want (including her family). If they have a problem with helping out with S, I assume they'll let you know. Tell W 'welcome to the world of D.' Ok, don't really say that : )