Protein is a type of Nutrient. Nutrient is related to Good. Good is related to Idea. 
Sister is related to Family. Family is related to Blood. Blood is related to Substance. 
Protein --IsA--> Nutrient <--RelatedTo--> Good <--RelatedTo--> Idea 
Sister <--RelatedTo--> Family <--RelatedTo--> Blood <--RelatedTo--> Substance 