When Batfamily is written as a non-nuclear family it is really fun but the sad thing is people try to avoid that in canon (and fanon). For instance, a key example of non-nuclear Batfamily being is Babs and Bruce being Cass' mother and father respectively whilst being platonic colleagues, and fandom is often afraid to do even acknowledge that. People like Helena and Azrael who are members of the batfamily but in no way fall into the traditional family roles are just ignored entirely (or for Helena reduced to exclusively a bird of prey, ignoring her relationships with Dick and especially Tim). People even are weird about the fact that Steph is emotionally Damian's big sister despite not being anyone else's sister, or Bruce's kid. Adoption and fostering can create a non-nuclear dynamic, but most aspects which explore its nuances (Duke and his living but Joker-ified parents, and the fact Bruce is exclusively a mentor to him rather than immediately falling into a father-son dynamic) are neglected. The Batfamily is not a non-nuclear family when it is just Bruce having an uncomplicated father-child relationship with Dick, Jason, Tim, Cass and Damian.
Also a fun example of a DC family that's still allowed to be delightfully non traditional and complex (and I haven't seen as big a fanonisation of) is the flashfam. Like Jay Garrick is the grandfather of the group as well as a mentor, but he has no biological or legal connection to anyone else. Bart is Barry's future grandchild back in time who's being raised by a combination of Max Mercury and the Garricks. Wally grew up with his neglectful/abusive parents but emotionally saw his Uncle Barry and Aunt Iris as more important nurturing figures. Johnny and Jesse Quick just kind of there as an adjacent speedster family. Then there's reformed rogue Hartley Rathaway as the emotional support communist Uncle of the West-Park kids, and Wally's best friend.
