Robin is Nightwing's step brother
Robin killed Nightwing
Pre History
Batman is Nightwing's foster father
Injustice 2
Starfire is Nightwing's girlfriend
Other Relationships:
John Grayson (father, deceased), Mary Grayson (mother, deceased), Bruce Wayne/Batman (adoptive father), Jason Todd/Robin II/Red Hood (adoptive brother), Timothy Drake/Robin III/Red Robin (adoptive brother), Damian Wayne/Robin V (adoptive brother)
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