Van is related to Family. Family is related to Party. Party is related to Debut. 
Climate is a type of Condition. Condition is related to Rain. Sprinkle is a type of Rain. 
Van <--RelatedTo--> Family <--RelatedTo--> Party <--RelatedTo--> Debut 
Climate --IsA--> Condition <--RelatedTo--> Rain <--IsA-- Sprinkle 