Date is related to Meal. Meal is related to Pig. Pig is related to Cop. 
Disaster is a type of Emergency. Emergency is related to Help. Help is related to Aide. 
Date <--RelatedTo--> Meal <--RelatedTo--> Pig <--RelatedTo--> Cop 
Disaster --IsA--> Emergency <--RelatedTo--> Help <--RelatedTo--> Aide 