Holiday is related to Case. Case is related to Letter. Initial is a type of Letter. 
Complaint is related to Chief. Chief is related to Boat. you are likely to find Boat in/at/on Garage. 
Holiday <--RelatedTo--> Case <--RelatedTo--> Letter <--IsA-- Initial 
Complaint <--RelatedTo--> Chief <--RelatedTo--> Boat --AtLocation--> Garage 