Divorce is a synonym of Separate. Separation is derived from Separate. 
Mother is a different concept from Daughter. Daughter is related to Relative. Relative is related to Grandfather. Grandfather is derived from Father. 
Divorce <--Synonym--> Separate <--DerivedFrom-- Separation 
Mother <--DistinctFrom--> Daughter <--RelatedTo--> Relative <--RelatedTo--> Grandfather --DerivedFrom--> Father 