No. Robin does turn into Nightwing, but not because he is bad. Nightwing is still an ally of Batman.
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No, neither Nightwing nor Batgirl have children.
Nightwing
No and the first robin was called nightwing
He changes his name to Nightwing.
"Nightwing" (1979). Stars Nick Mancuso, David Warner, Kathryn Harrold, Strother Martin.