I remember thinking when my D was younger that if W wanted to go out, I was the babysitter. I didn't see it as spending time with D's; I considered it babysitting. That is what I am reading in your posts about son as well. I know you haven't said those specific words. I am just putting what I see in context. I hope I am wrong.
BD: 8/20/2012 W Files: 8/23/2012 S: 8/25/2012 (I moved out) D Final: 3/5/2013