That's a very good suggestion. I have been meaning to call the school's social worker (SW) back after she called me at work yesterday to ask me about what I thought might be causing S6's behavior to worsen, primarily on Wednesdays and Thursdays. I talked it over with her, but in the end I had no real answers for her since I do not normally get custody of my sons during the week. I made sure the SW understood the custody arrangement, and I suggested that maybe W could shed more light on this.
Later, right before the parent-teacher meeting, I saw W and asked whether the SW had got a hold of her. She said yes, but she didn't have time to talk with her. So, I explained to W what the SW was asking about concerning the poor behaviors on Wednesday. W actually blew it off and said that Mondays were worse with S6 since that was right after they were in my custody.
So, W will amplify any faults or problems that might have weak relativity to my influence, but will ignore or dismiss any problems that occur on her watch.