The question soes not make sense to me. Maybe it could if I knew what you are referring to. Please specify: what is

• a "Block object"?
• a "child [block] object"?

If this is about perltooc, there's a recipe for a class method counting objects of that class in the book by TheDamian

Cheers, Sören

Update: - fixed the link to perltooc
- found the object instance counter in perltoot