Observer is a type of Worker. Volunteer is a type of Worker. Volunteer is a type of Inform. 
Name is related to Agent. Agent is related to Sugar. Sugar is related to Make. Make is related to Paint. 
Observer --IsA--> Worker <--IsA-- Volunteer --IsA--> Inform 
Name <--RelatedTo--> Agent <--RelatedTo--> Sugar <--RelatedTo--> Make <--RelatedTo--> Paint 