Bill is related to Man. Man is related to Doctor. you are likely to find Medicine in/at/on Doctor. 
Coal is related to Daughter. Daughter is related to Person. Person wants (to) Hip. 
Bill <--RelatedTo--> Man <--RelatedTo--> Doctor <--AtLocation-- Medicine 
Coal <--RelatedTo--> Daughter <--RelatedTo--> Person --Desires--> Hip 