Daphne's trying to talk her family back home in england about a vacation they're all about to go on. They're giving her a hard time, and Marty's taking Frasier's case as well.
So Daphne asks him just as he's about to leave...
"Dr. Krane, Why is it so easy to love our families yet so hard to like them?"
I just loved it... Kinda sums a lot of things up!