It’s not a matter about Nancy being a parent. Easy for anyone living with someone every day for a long time to build a deep-seated impression & not notice changes. Luann’s the little girl whose aunt is surprised to find out she’s now a young woman attending college.
Your sentiment reminds me of an old Rodney Dangerfield joke: “I want to die peacefully in my sleep like my grandpa. Not yelling and screaming like the passengers in his car.”
No, just meant the phrase as an anecdote, (the old “my, you’ve grown up so big” aunt seeing her niece for the first time in years one)