Ought is related to Do. Do is a synonym of Finish. Finish is the opposite of Initiate. Initiate is the opposite of End. 
Parent is related to Deer. Deer is a type of Animal. 
Ought <--RelatedTo--> Do <--Synonym--> Finish <--Antonym--> Initiate <--Antonym--> End 
Parent <--RelatedTo--> Deer --IsA--> Animal 