Maintain is a synonym of Declare. Declare is a synonym of Hold. Hold is related to Embrace. 
Boy is a synonym of Son. Son is the opposite of Dad. Dad is related to Person. 
Maintain <--Synonym--> Declare <--Synonym--> Hold <--RelatedTo--> Embrace 
Boy <--Synonym--> Son <--Antonym--> Dad <--RelatedTo--> Person 