what happens when Unit in Hierarchy is destroyed?

I have a unit called Girl who's parent is mover, who's parent is Girlbots. what happens when mover is destroyed? is Girlbots (the root) the new parent of Girl automatically?

eg.

Girlbots
--Mover
----Girl
  |
  |
  |
 Mover dies and it goes to:
  |
  |
  |
Girlbots
--Girl 
??

No. Girl would be destroyed. Whenever a parent is destroyed, all its children would be destroyed unless you script otherwise by making the children children of another object.