POOR POOR YOU!
I almost know how you feel with 4 of our own. 13,12,11, and 4. The youngest is the one that if I had first would of stopped! They are great kids also, but even on their best behavior they are a handful to deal with, and your right if you can get 2 to behave at the same time its a miracle, and if 3 behaved you better start asking questions and make sure you know exactly where the 4th is! If all of them behaved at once, then you know you need to call the men with little white coats to haul you off because you done went off the deep end.
A friend of mine had 3 girls and tried for a boy and ended up twin girls. I can't imagine but then again she thought I was joking when I told her I would trade her my little one for all of hers for a day. Needless to say she was ever so happy to have survived the day and secondly she is glad not to have had a boy! (at least not one like mine)