I just know that Bruce took after Martha's charming, classy ways of naming people (mama's boy)
his first word after Mama and Baba are "dearest" because of how often the name is thrown between his parents
He carries on with this to his kids because of course he does
"chum" was Thomas' favorite petname so the first son got exclusive rights to this
"my heart" is also thrown around when the family began to grow and everyone orbited around Dick's light
Bruce, during a speech: My heart goes out to all of you...
Dick "my heart" Grayson-Wayne, in the bg: NO THE FUCK I DON'T!
Jason is "sweet boy" because he was a very sweet and tiny baby, it suits him perfectly
both of their (emotionally dense) hearts soar when the name is used
Bruce: yes this is Jason, my sweet boy, the sweetest boy who ever lived
Jason, 6"7 brickhouse of a man, clad in guns and harnesses: yes, it's me, I am sweet boy 🧍
"my dearest love" is said in their most needy moments, which is where their relationship first began anyways
Tim also gets variations of "my boy" (besides sweet)
because that's Thomas' way of address Bruce too
she gets a monopoly on all the girly names because as is her right as the only daughter of the Waynes
any variation of "(my) girl" is her absolute favorite
my darling girl, my brave girl, sweet girl, my dear girl
Cass "girl, not a weapon" Wayne: yes 🥺 that's me 🥺🥺 my dad's girl 🥺🥺🥺
Bruce makes a point to speak Arabic to Damian out of respect to his heritage, so the word "my heart" comes in both tongues
but in the more vulnerable moments, Damian is "my darling boy"
it was also Martha's nickname to baby Bruce, so Alfred says
The kids know the stories behind the names so they get very protective of them.
They're not allowed to take each other's petnames, nor let others have them, even names close to their own. There was a whole family court drama over the legalities of variations of "my boy" and it ended in blood and terror
There is a natural order of things in the family
Bruce doesn't get the memo
So when Bruce starts dating Hal and pours all of his petnames onto him, the kids are all but a little disgruntled that said natural order is wrecked by an overly sweet prospect stepdad
Bruce, staring lovingly at Hal sparring: Look at my man go!
Tim, "my boy", Drake, aiming a sniper rifle: girl, I'm trying
(BruHal in bed, cuddling)
Damian "little love" Wayne, from beneath the bed: I beg your fucking pardon? My father deserves better names than that, especially as a response to a name like my own!
Hal, grabbing a broom: WHAT DID I SAY ABOUT ENTERING FROM THE UNDERBED LATCH! GIT!
Hal: Looking cute, baby doll
Hal, from the other foom: Hey sweetness, can I get you for a second?
Bruce: [doesn't reply immediately]
[Jason "sweet boy" Todd-sounding footsteps follow heavily and quickly]
Bruce: [starts speedrunning to save Hal's life]
(breakfast table at Wayne manor)
Hal, half awake and vulnerable: Hey, sweetheart, can you pass the eggs please?
Dick "my heart" Grayson: [hands him poisoned eggs]
Bruce: [sighs and takes the poisoned eggs, giving it to Alfred for disposal]
Alfred, strict, disapproving military dad: [still hands it over to Hal]
Bruce: WHAT IS WITH YOU PEOPLE-
Bruce, sighing: You kids know that petnames aren't an intellectual property
Dick, snuggled on top of Bruce: He already has "spooky"...
Jason, curled by the foot of Bruce's bed: ...that is close to "pookie" which is Steph's favorite name. hey, she says to set up an arbitration court again for that, by the way
Tim, hooked under Bruce's arm: good idea. how does Friday 2 pm work for everyone?
[Damian and Cass nod from sharing Bruce's other arm]
Bruce: sorry about this, Hal
Hal, sitting on the platonic-cuck chair: you're not who owes me the apology, baby
the court of wayne family arbitration (yes, it's a real thing, Bruce, you're just permanently banned due to contempt) has since granted Hal the exclusive rights to "dearest" and "darling", and "my love" is allowed on account that Damian has a hegemony on all Arabic petnames
Alfred is cited as court marshall