Batman headcanon that one time Impulse was speeding around being his usual self and one
annoyed concerned citizen asked him where his parents were. Now Bart is from the future so he doesn’t really have an answer, so he goes with the next best response which is to point over at Superboy and Robin who are bickering over something. And so Tim and Conner became the mom and dad of Young Justice.
Though he denies it, Conner is the mom, fun and kooky and willing to play with the others but also more emotionally available and sweet. Tim is the dad, stern and likes to play by the rules, but a good teacher and no one can resist his disappointed face (honed, of course, by the ultimate dad, Batman). Bart thinks it’s funny and continues to refer to them as Mom and Dad to the utter confusion of everyone. But to the reluctant parents’ chagrin, the nickname spreads.
Soon all of Young Justice is calling them Mom and Dad. Anyone who gets in trouble is told to ‘go see your Father’ and make the walk of shame over to Robin with their head hung. The girls teasingly ask Kon how he’s able to balance being a mother and a hero which Conner used to get furious over but he’s now resigned to his fate. Tim has lost count of the times someone has handed him a phone with a pleading look, he’ll pinch between his eyes but take the call and introduce himself as so and so’s father. The tradition continues into the Teen Titans and by this point, Tim and Kon are used to and just routinely answer to Mom and Dad while Starfire, Cyborg and Gar shrug their shoulders. They get it in a way, Donna and Dick were like their parents in a way.
So it’s not unusual to walk in the kitchen in the morning to see Tim reading the paper or doing work. Kon has 3 boxes of cereal set out and was kind enough to remember to get out enough bowls and spoons for everyone. The Titans are shouting and causing a ruckus, Kon yells at them to stop wasting all the milk. Tim keeps working but announces that he needs to head back to Gotham today so Mom and Auntie Starfire are on their own to watch the children. They kiss their dad goodbye and wave as he teleports back to Gotham. He makes his way to Bruce’s study and wearily sits in the chair beside his mentor who is also nursing a headache over a child or three. They sit in companionable silence as only someone who is the guardian of a bunch of rambunctious and lovable kids can be.