Policeman is related to Law. Law is related to Degree. 
Family is related to Son. Son is related to Relationship. Relationship is related to Daughter. Daughter is related to Sorry. 
Policeman <--RelatedTo--> Law <--RelatedTo--> Degree 
Family <--RelatedTo--> Son <--RelatedTo--> Relationship <--RelatedTo--> Daughter <--RelatedTo--> Sorry 