Potential is related to Oil. Oil is related to Source. 
you are likely to find Sink in/at/on Laboratory. you are likely to find Rat in/at/on Laboratory. Rat can Pet. Pet is a synonym of Sister. 
Potential <--RelatedTo--> Oil <--RelatedTo--> Source 
Sink --AtLocation--> Laboratory <--AtLocation-- Rat --CapableOf--> Pet <--Synonym--> Sister 