Relative is a type of Organism. Virus is a type of Organism. Aids is a type of Virus. Aids is related to Disease. 
Deal is related to Great. Great is related to Being. Being is related to Virtue. 
Relative --IsA--> Organism <--IsA-- Virus <--IsA-- Aids <--RelatedTo--> Disease 
Deal <--RelatedTo--> Great <--RelatedTo--> Being <--RelatedTo--> Virtue 