you are likely to find Beer in/at/on Refrigerator. you are likely to find Milk in/at/on Refrigerator. you are likely to find Milk in/at/on Market. 
Body is related to Elbow. Elbow is related to Ankle. Ankle is a type of Bone. 
Beer --AtLocation--> Refrigerator <--AtLocation-- Milk --AtLocation--> Market 
Body <--RelatedTo--> Elbow <--RelatedTo--> Ankle --IsA--> Bone 