Getting the value of a field through a related entity

[VladZP]

Good afternoon I have problems getting field value through related entities.
I have next structure: Brand has One-to-Many Relation with Product. Product has One-to-Many Relation with Model. Model has One-to-Many Relation with Modification. I want to display Product.name and Brand.name in my Modification entity, but I can display only model's fields. How can I get product's fields and brand's fields in my modification entity?