Jann Blackstone, Tribune News Service

Q. My ex just changed the email address that he uses to communicate with me to include a derogatory reference to me. It’s obvious what he’s doing, but I’m having a difficult time staying calm. What’s good ex-etiquette?

A. First and foremost, it’s important to acknowledge that any attempt to disrespect you, especially in a shared co-parenting environment, is entirely unacceptable. Co-parenting by definition requires mutual respect and cooperation, which is hard to maintain when one party undermines the other through such petty behavior. That said, the best course of action in situations like these isn’t to retaliate, but rather to rise above the negativity and continue to focus on the children’s best interests.

Here are several key principles that ma

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