Related is related to Reading. Reading is related to Understanding. Friend can be used for Understanding. Afraid is etymologically related to Friend. 
Small is related to Smile. Smile is related to Being. Being is related to Cross. 
Related <--RelatedTo--> Reading <--RelatedTo--> Understanding <--UsedFor-- Friend <--EtymologicallyRelatedTo-- Afraid 
Small <--RelatedTo--> Smile <--RelatedTo--> Being <--RelatedTo--> Cross 