Ex-etiquette: Is son's behavior really different (read better) with her ex?

Q. My 7-year-old son has always been a handful, but now that his father and I have separated, he's really acting up. His father says he never acts like that at his house, but I don't believe it. I'm thinking about sneaking over and observing through the windows. I know you'll probably tell me that's not good ex-etiquette, but I don't know what else to do!

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