"A couple of years ago, I read the findings of a study on the effects of divorced and separated parents talking negatively about their exes in the presence of their children. What I remember about the study most vividly is really just one thing: that it's devastating for a child to hear one parent speak ill of the other. In fact, so much so that the researchers found it was less psychologically damaging if a parent said directly to the child "You are a worthless piece of shit" than it was for a parent to say "Your mother/father is a worthless piece of shit."

I don't remember if they had any theories about why that was so, but it made sense to me. I think we all have something sturdier inside of us that rears up when we're being attacked that we simply can't call upon when someone we love is being attacked, especially if that someone is our parent, half of us-the primal other- and the person doing the attacking is the other half, the other primal other."