Weekend is a type of Date. Date is related to Guy. Guy is related to Guard. Guard is related to Uniform. 
Thought is related to Psychology. Psychology is related to Gender. Gender is related to Girl. Girl is related to Brother. 
Weekend --IsA--> Date <--RelatedTo--> Guy <--RelatedTo--> Guard <--RelatedTo--> Uniform 
Thought <--RelatedTo--> Psychology <--RelatedTo--> Gender <--RelatedTo--> Girl <--RelatedTo--> Brother 