not 'Talia being Jason's adoptive mother' or 'Talia being another adult who fucked Jason over', but a secret third thing: asshole Aunt Talia who accidentially got Jason accepted into the Al Ghul family, regrets it, and now they're dicks to each other about it.
Jason is just naturally very good at annoying people, and in his mind, Talia is the reason he has to deal with pit rage for the rest of his life. of course he's going to be a little shit. Talia isn't a mother to him (he's had enough with mothers after Sheila), but rather he sees her like some audacious older sister/aunt figure. Talia realised having Jason around was a burden the second he beat her at chess one time and has never once treated him like a child, let alone a child in her care, so they end up with the weird dynamic of being almost family but also pissing each other off akin to Jim and Dwight from the office.
the funniest part about it is that Ra's? is fine with Jason. like sure he's a fuckin' asshole but he's good at his job around the league; is powerful and a worthy heir, not to mention he's a good tutor to Damian who adores Jason with his whole soul. the only thing is he and Talia don't get along and so obviously this means Ra's has to spend his spare time dealing with his heir/chief general and his daughter pissing each other the fuck off like CHILDREN. he is so tired.
Talia: i swear, Jason, i can and will send you back to the pit!
Ra's head in hand: what now?
Talia: he tripped me on the way in!
Jason, working a bodyguard shift and absolutely did use his sword to trip her up: i absolutely did not.
Jason: there are no cameras in here, how can you prove anything?
Ra's, sighing: Talia, Jason says he's sorry. ok?
Jason and Talia, simultaneously: i do NOT-/he does NOT-
Jason, to Damian: your mother is a whore. slept with my dad once.
Damian, 7: ...i am aware. he is my father also.
Jason: tried to sleep with me once, too.
Damian: i did not know about tha- seriously what is wrong with the two of you-
Talia, echoing from down the hall: JASON PETER TODD-AL GHUL IF YOU DON'T STOP TELLING MY SON ABOUT MY PERSONAL HISTORY-
Jason, opening a secret passageway to escape: oki bye-bye Dami enjoy lunch!
Damian, tired and used to this: *waves goodbye*
Bruce: my relationship with Talia was... complicated. but we still held a significant amount of care for each other, and i am grateful she granted me Damian.
Dick: she's a fucking weirdo. i hate her.
Bruce, resigned: yes i'm aware you don't like her but she's still Damian's mother so could you-
Jason, walking in: what we talking about?
Bruce: i'm trying to convince Dick not to antagonise Talia's name around her son.
Jason: oh, Talia? nah fuck her she's a bitch. you know she 'accidentially' decapitated my donkey once during a group trip and fuckin' left me in the desert to travel two weeks back to the compound. asshole. ate all my cookies while i was gone.
Dick: FINALLY SOMEBODY FUCKING GETS IT-