I think in the context of talking to Thomas, bringing up just Damian (who is the true, legitimate, Wayne heir) (not Batman heir) makes perfect sense rather then mentioning all the Robins or Batgirls. BUT TUMBLR IS ALWAYS A DRAMA QUEEN!, And tTim Drakes parents are not dead.
“True Wayne heir”
So you DO believe that adopted kids aren’t real children. Nice. Nice nice nice nice nice.
As the girlfriend of an adoptive mother, kindly fuck off. Adoptive children are completely and totally equal to biological children.