Block showing Parent Taxonomy Term of current Node
I think this is impossible with the Views module.

To achieve the goal, you can create a block with a relation to the "Holiday Cards" term. Under Filter criteria select Taxonomy term: Name (= Holiday Cards). 

To display the block only with the content related to another taxonomy term, you can consider to use the Context module.


Instal the module and turn it on.
Go to /admin/structure/context/add and create your new context
Under "Conditions" choose your taxonomy term "Trees"
Under "Reactions" choose "Blocks"
Select your block created in views and place it in appropriate region
Save the context


That's it! Your block with relation to "Holiday Cards" will be displayed only with content which is related to "Trees."