Eat is related to Bite. one thing you do when you Eating is Bite. 
Serious is related to Concert. Concert is related to Musical. Musical is related to Dance. Dance is related to Social. 
Eat <--RelatedTo--> Bite <--HasSubevent-- Eating 
Serious <--RelatedTo--> Concert <--RelatedTo--> Musical <--RelatedTo--> Dance <--RelatedTo--> Social 