Inmate is related to Patient. Patient is a type of Case. Case is related to Pillow. 
Automobile is related to Vehicle. Vehicle is related to Road. Road is related to Pat. 
Inmate <--RelatedTo--> Patient --IsA--> Case <--RelatedTo--> Pillow 
Automobile <--RelatedTo--> Vehicle <--RelatedTo--> Road <--RelatedTo--> Pat 