How do I access grandparent model attribute in Ember using ember data

I have 3 models that are related: Parent > Child > Grandchild.

Parent hasMany Child Child hasMany Grandchild

I have a route /grandchildren that loads all grandchild records.

In the grandchildren template I am able to call .

My question is how do I access the Parent's attributes from the same template? I tried but it's coming up empty.

What is the Ember way to access a related model's attribute that's 2 levels deep?