Grandchild is the opposite of Grandfather. Grandfather is a type of Ancestor. Ancestor is a type of Relative. Relative is related to Close. 
Crop is related to Photo. Photo is related to Picture. Picture is related to Print. Print is related to Laser. 
Grandchild <--Antonym--> Grandfather --IsA--> Ancestor --IsA--> Relative <--RelatedTo--> Close 
Crop <--RelatedTo--> Photo <--RelatedTo--> Picture <--RelatedTo--> Print <--RelatedTo--> Laser 