Intending stuff is not enough to tell nested events apart. It would be easier to recognize nested events by using different frame colors (in contrast to parent events). Like this:
Hi, I am busy parent that never comes to kid's shows!
+ Hello, I am the kid that pees onto your lawn!
++ Woof! I'm the kid's puppy!
+++ And I am a flea on the puppy's tail.
+ Hi, I am the girl that likes to turn music to the max!
++ Yawn... I'm the girl's deaf cat.
Just an idea.