Deb (who is MY best friend) has a similar relationship with her sister.

Then there's *my* sister. Both my wives have totally understood why I refer to her as "The Princess Bitch" (although Linda, wife #1, just shorted that to "The PB," as in, "So, what catastrophes has the PB caused lately?"). Somewhere in my marriage to Deb we shifted from Deb defending my sister to me... okay, not complaining about her as much, I guess, since Deb kvetches about her enough for both of us. 😼