My kids have been home with me the past couple of weeks (we're doing minimal summer camp), and they've been driving each other crazy this week. Yesterday they argued so many times that I got pretty frustrated and angry.  It was a tough day.
That would take such toll one me. Just make sure they have enough to keep them occupied maybe.
Yes, it's been rough.  I have a ton of work to do for my day job (working from home mostly this summer), and other stressful things going on, so I'm not doing a great job of keeping them entertained.  
Might have to bring them to the park and tire them out. School should starting up soon.