Originally Posted by
Restingvoice
Since Grayson is canon, yes. Except for the ethnicity. Grayson established he's of Romani descent but no mention how. Nightwing Rebirth specified he's half from her mother's side
No, that one's from the even older Nightwing #0, his first New 52 origin, which since then expanded in Batman and Robin Annual #Iforgot where Dick was taken to live at the Manor after he decided to be Robin, and expanded again in Grayson Secret Origin #8
In New 52, Nightwing said he was adopted way back in issue #1. It's a throwaway thought box that a lot of people forget because they're too busy angry at Nightwing #0 when it looked like Dick never stay at the Manor.
If Rebirth changed anything, I don't remember except for his mother being Romani.