Aide is related to Help. Help is related to Association. Association is a type of Union. 
Scene is a type of Incident. Scene is a type of Area. Area is related to Waist. Waist is related to Shirt. 
Aide <--RelatedTo--> Help <--RelatedTo--> Association --IsA--> Union 
Incident <--IsA-- Scene --IsA--> Area <--RelatedTo--> Waist <--RelatedTo--> Shirt 