Like I said before, the biggest trouble with making Black Canary into Tim Drake’s grandaunt and giving Nightwing a businesswoman for a female cousin’s that it risks emasculating them as well as running counter to certain authorial politics. As Dinah Lance’s married to Oliver Queen and Olly’s a liberal, that sort turns Chuck Dixon’s run upside down considering Dixon’s a noted conservative.
Should Dinah retain that Canary Cry, there’s a chance that Tim Drake’s personality would change further into that of a belligerent idiot who has to deal with a really loud grand-aunt and a grand-uncle who could shoot him. Though that’s also implying his stepmum Dana Drake probably wasn’t that strong of a woman the way Dinah is. She endured torture (at least in the older stories) and soldiered on as the fighter she is.
Tim did interact with her but having her as a relative means that rather than Dana, she could’ve raised Tim more often or at least bothered to help her nephew jack along. Though I still think having her as a relative does challenge the narrative the way Dana and Stephanie Brown don’t. A woman who actually runs a humble flower business and can be really loud gives her a big advantage to women who just help their male counterparts a lot.
But that’s also implying that Tim Drake himself doesn’t seem to have interactions with his actual relatives the way Wally West does. (I actually think Bart Allen also has a similar problem where despite being Wally’s nephew and Barry’s grandson, he hung out more with Max Mercury.) I still think emphasising Barry and Dinah more instead of Max and Bruce would mean that Bart and Tim’s personalities would have to change.
Actually so do theirs too. Consider what’ll happen if Barry, rather than Max, had bothered to raise or interact with Bart more often to the point where Bart would’ve ended up as the detective that Tim should be. And when it comes to Dinah Lance, Tim would’ve ended up as a more comical Jason Todd.
Since I said that Barry and Dinah’s personalities would change, I think Barry would’ve ended up realising he’s got more in common with Bart than their original authors would’ve intended to and Dinah would end up scolding Tim a lot for messing up. Instead of being just another superheroine guest star, she’d end up as a strong, if forceful maternal figure.
Practically and essentially the true opposite of Dana Winters. Though that’s also implying that Dana’s rather passive in a way Dinah Lance could never be when you think about it. Even if you downplay Dinah’s superheroine aspect to play up the grandmotherly one, she’d still come off as forceful and tending to suffer gladly considering their respective characterisations.
The same could be said of what would happen if Dick had a businesswoman for a cousin. Well I still suspect should Bart and Tim interact more often with Barry and Dinah (now grandfathered into being Tim’s grand-aunt), Barry would’ve ended up just as silly and comical, even naughty as Bart is and Dinah could’ve been in charge of caring for Tim but more forceful to boot.