Grandparent is a type of Animal. Grandparent is the opposite of Grandchild. Grandchild is the opposite of Grandmother. Grandmother is a different concept from Grandfather. 
Performer is related to Person. Person is related to Character. Character is a type of Adult. Adult is a synonym of Dirty. 
Animal <--IsA-- Grandparent <--Antonym--> Grandchild <--Antonym--> Grandmother <--DistinctFrom--> Grandfather 
Performer <--RelatedTo--> Person <--RelatedTo--> Character --IsA--> Adult <--Synonym--> Dirty 