Family is related to Set. Set is related to Limit. Limit is a synonym of Specify. 
Rub is a synonym of Scratch. Scratch is a type of Rival. Rival is a synonym of Competitor. 
Family <--RelatedTo--> Set <--RelatedTo--> Limit <--Synonym--> Specify 
Rub <--Synonym--> Scratch --IsA--> Rival <--Synonym--> Competitor 