Just got a text from W asking if I could take D4 to a children's birthday party tomorrow. W was really stressing out about it because a lot of the friends who she thinks hate her will be there.

About an hour ago, I told W that I had plans with S1 tomorrow.

What should I do? Be a nice guy, take D4 to party, and "save" W from this awkwardness OR tell her that I already have plans and can't do it?

I could be a "hero" but I don't know if that's the right thing to do. I initially offered to take D4 to this party a couple of days ago.

I'm leaning towards saying yes just because I know it's important to D4 and I don't want D4 to suffer.

Help!!

Me:35 W:30
D:4 S:1
Bomb: 01/08/15, discovered EA & PA
In House Separation: 01/14/15
W moves out: 04/05/15
I tell OM's W about A: 04/15/15
W serves D papers: 06/19/15
Mediation: 09/16/15
D final: 12/01/15