Dad needs to figure out care for his kid during his time. Yes, the late notice by BM would piss me off. That's why we never left anything up to bm during our time. 

WHOA! What are the laws in your state? Is he over the minimum age? If he is I would have called BM on the bullshit and sent her an email showing what the minimum age is for being left alone and stated that as his father I felt he was old enough and responsible enough to be home for 6 hours a day. He has food, he has a phone for emergencies. He is good. 

Especially since she refused to communicate earlier so you could prepare. Call her bluff! I think too many people cower to BM's! She doesn't get a say as long as you are not breaking the law. 

I would be livid! at the BM but also BF. It sucks but he should have confirmed earlier with BM. And made sure that she had him signed up for camp/care etc. Just a suggestion...make sure next time he keeps texting and asking and after awhile if she doesn't answer say that since she isn't replying you are taking it that she has planned care and that if she needs him to do it then she needs to let him know ASAP (by certain date) otherwise she is responsible.  At least that will be recorded for court matters.  &  Maybe next year BF can be involved in arranging the camp/care and just make sure that it is booked.  Nothing you can do about the past :(  I feel your pain and frustration though. 

It's your husband's responsibility to arrange daycare during his time, not the BM's.  Now, it would have been nice of her to be cooperative and arrange it since she was arranging the rest of the summer (and appears to have done so in the past), and it was downright uncooperative of her to not respond to your husband.  She essentially blindsided him by changing the status quo and not communicating, which was a total bit*h move.  At least now you know what you're dealing with for the future.

Out of curiosity, if you have SS EOWE plus two days a week, didn't your husband know where he was going to camp?  I'm not sure if when you say 2 days a week you mean overnights or just the days (my SO has EOWE plus 2 overnights, which is essentially a 5-2-2-5 50/50 schedule).  With that much involvement, I'm surprised he didn't know the camp arrangements, which would make it possible for him to contact them directly.  I understand why he didn't, since the BM has taken care of it in the past, but it's something to keep in mind for the future.

BM called the cops on us twice when we left skids home alone for an HOUR. SS was 11 and SD was 8. SS is mature.Cops came and talked to us only to tell us there is no minimum age law in our state so there is absolutely nothing they can do about it, and the Officer even told us that SS is very mature for his age and didn't see the problem. She got nowhere. Nice try BM.

Hire a babysitter.

My girls are 11yrs and 8yrs, (Both bdays in September.) They stay by themselves when I have to go to work. They know the rules; don't go in the living room (picture window to outside), don't anwer the door, if they need to call me, they facetime (no landline). They are very responsible, and they have a few chores that they have to do before I get home (or DH), but otherwise, as long as they follow the rules, do what you want.

My SS20, when he was younger (cough15-16cough) couldn't be left by himself. It's no wonder he's having trouble at college, no real coping skills.

I personally don't care about any minimum age law, I wouldn't want my daughter left home alone for six hours at the age of 11... Or even two hours. When she's 13 maybe. The mother should have told your husband sooner that she wasn't booking or paying for childcare so you could sort something out... I take care of childcare all year round, except on her dad's time... In which case he sorts it... Or asks if he needs eusuppo.

11 year old shouldn’t be home all day or part of a day if parents are at work. Yes it’s ok to tell the other parent that kid can’t be home alone. My house was robbed and luckily DD wasn’t home but I kniw someone who had house burglarized and their two minor kids were home alone. Kids were tied up to a chair  in the basement etc 

If dad can’t or won’t provide  child care then he should have left SS with BM 

its totally crazy dad expected BM to take care of business on his custody time 

My son is 11 - he does really, really well on his own. He has been left for a time on many occasions. He walks home from school and lets himself in and I come back from work - usually I try to only be an hour or work from home those days so I am there when he gets there, but this can't always happen. He looks after himself and does not break rules. If I had to in AN EMERGENCY leave him for six hours, I believe he would be fine. There is no way no how that I would let him be on his own for 6 hours a day for a whole week in the summer. It's not fair to him. It's not good for him. And if I found out my ex was doing that, I would blow a gasket. If you're not on the breadline where you both have to be working to keep body and soul together, I'd understand leaving him. Sometimes needs must. But if dad has vacation time or you have any money to spare for childcare, no freaking way. 

Anyway, lesson learned. Personally, you've been lucky BM is picking up the tab on childcare for that week for however long she's been doing it. Yes, she should have said "I'm not booking it this week." But you don't know for sure she didn't or that there weren't conversations in years past. 

Funnily enough, in my case it's my partner - the stepdad -  who gets the most worked up about BS being on his own, even though he knows he's fine. My partner has come home from work early (he can work at home) to be there for him when he gets back from school when he knows I can't. If it's longer than an hour and a half, I either swap days with my ex or ask my partner to look after him - if he can. But my partner doesn't like him alone longer than an hour. He doesn't like to leave his kids alone longer than 30-40 minutes. But then again, his youngest is only 9 and 2 or three boys on their own....not such a good idea.