Sankaku Channel/

whiterook6 said:

There is already a way to do these things, check the help page to see what you can use.

http://chan.sankakucomplex.com/wiki/show?title=help%3A_quick_guide

I'll save you some time and quote it here:

parent:1234
Search for posts that have 1234 as a parent (and include post 1234).
parent:any
Search only for posts that have parents.
parent:none
Search for posts that have no parent.
has_children:true / false
Search only for posts that either have or don't have children.