Widgets and memory management

[Ian King <king eiffel com>]

Is there any decent documentation I can look at to find out about the memory 
management system employed in gtk.  I need to know certain things such as. 

If a container gets destroyed, does it destroy its children?
If you call gtk_object_destroy on a parented widget, what happens?
If I have an object that is always floating, will an object_sink cause the 
memory to be deallocated?

Thanks for your time.

Ian King