Show a view of Related Terms to a given Taxonomy term
I have done the same thing through Panels. I was stuck with views for a long time. All you have to do is to override the "Taxonomy Term Template" in panels. Add a new Variant with settings of your choice (default ones would be fine too). Go to 'content' section and add new one. Choose 'list of related terms' and inside it you would find the related terms you need. Make sure you give it a valid path and there you have it! 

I don't know how this could be done in views but for me this is more than fine.. :)