Warning: Spoilers for Detective Comics #1086!One line uttered by Batgirl speaks to her deeper relationship with Batman and the core meaning of the Bat-Family. When some readers hear the title of Bat-Family, they think of a super-team of Batman’s closest friends, allies, sidekicks, and partners. However, when discussing the Bat-Family, the emphasis should really be put on the word “family.”
https://screenrant.com/batgirl-cassandra-cain-batman-father-daughter-duo/