People is related to Character. Character is related to Voice. Voice is related to Record. Record is related to Statement. 
Gasoline is a type of Fluid. Gasoline is a type of Liquid. 
People <--RelatedTo--> Character <--RelatedTo--> Voice <--RelatedTo--> Record <--RelatedTo--> Statement 
Fluid <--IsA-- Gasoline --IsA--> Liquid 