Smile is related to Position. Position is a type of Relation. Relation is related to Father. Father is related to Sibling. 
Reduce is related to Small. Small is related to Word. Word is related to Communication. Traffic is a type of Communication. 
Smile <--RelatedTo--> Position --IsA--> Relation <--RelatedTo--> Father <--RelatedTo--> Sibling 
Reduce <--RelatedTo--> Small <--RelatedTo--> Word <--RelatedTo--> Communication <--IsA-- Traffic 