The CO gives DH the entire summer with SS5. Save for a single 2 week period of BM's choosing with a stipulation that dates cannot be repeated on consecutive years.

Last summer, the BM tried to convince DH to break up her two weeks into 7 weekends, each one beginning on Friday and ending on Monday. (Yes you can do math, that is 21 days, not 14.) She insisted that because his "weekends" during the school year go from Friday until Monday her summer weekends should too. Except the CO doesn't give her summer weekends, it gives her 2 consecutive weeks. After a week of threatening text messages and a few facebook rants where she referred to DH as having the intelligence of a potato with ears, she finally ended up with a random week in June and the last week before school starts.
She insisted on choosing SS's daycare program, and then decided that she was not going to pay for daycare because the CO doesn't directly specify that she has to. She also made a point of going to the daycare and carefully explaining to each employee that DH is abusing SS and must be watched very carefully around him. And a point of removing me and DH's brother and sister from the list claiming that as his mother only her family was allowed to be there.

You think the nonsense ended there? Oh no. When SS arrived for summer break he spent the first 3 days in bed crying hysterically "mommy's gone, my mommy's dead" After he went to visit her for her one week in June he once again returned and cried "mommy's gone" "you killed my mommy" for three more days.
Not only that but this woman is so emotionally unstable she drove to SS's daycare 3 days a week and SAT THERE STARING AT HIM for 2 hours a day.
To top off the summer, she asked to move the final week up by one day, and promising to return SS for the final day of summer. Then she sent some rant about how the CO doesn't really specify so she's just going to keep SS for the extra day.

So since summer is coming again, so is BM's mental breakdown. The first thing was a completely unprovoked facebook rant saying she wishes she had a time machine so she can go back a few years and still have SS but not have to deal with coparenting drama. (In other words, "I wish id been smart enough to conceal the pregnancy and/or disappeared with SS before DH had the opportunity to file for custody.")

For visitation she asks for the last week before school starts again. Of course DH says no, since he already knows she plans on withholding SS for the extra day again, and why should she have the first day of school every year? The BM is arguing that because it's only one week, and not two consecutive weeks (because DH did her a favor and allowed her to split them) the part of the court order that says she can't have the same two weeks every year doesn't apply. This eventually degrades into some nonsensical jibberish about how if he doesn't agree to it she's simply going to take SS every weekend all summer instead.
In the midst of this DH is waiting for a callback for his phonecall with SS. When it finally comes 45 minutes of crazy texts later, it's painfully obvious she's probably spent a good chunk the last 45 minutes coaching SS. DH says "Hello SS" and there is dead silence. After 15 seconds BM goes "Talk to your father" and SS says in a strange clear voice with zero hesitation "Goodnight, I don't want to talk to you." By the way, its 6pm and broad daylight outside. DH responds with "I know you don't like talking on the phone, I just called to say I love you." Again 15 seconds of dead silence until BM says "say goodnight, I love you" and again with no hesitation in the same clear tone and mimicking BM's intonation exactly SS says "Goodnight I love you" and hangs up the phone.

This woman is a MONSTER. Its even more aggravating that its actually been pretty peaceful for the last few months and she is clearly becoming unhinged because she knows she has to go a few weeks without her "need fulfilling object." (I mean, its obvious she doesn't realize that SS is a human being that she is destroying with her behavior.)
She's also begun her insistence that DH put SS in a learning program over the summer because he is behind (because SS had 54 absences this year and I believe the reason was that she missed him too much while he was at school) but of course she's not going to pay for it. And yes, I am aware this won't fly once school actually starts but prek is voluntary so attendance isn't required so other than gape at her obvious disregard for her son's well being, there is nothing we can do.

I can't wait to see what happens when DH doesn't put SS in daycare this year so she can't have her 2 hour long daily staring visits.