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They never really talk about the way that Tim essentially parented Bruce for a while, but it's an open secret that Tim is the only other person besides Alfred who has a chance to make Bruce see reason when he's particularly stubborn. It doesn't really cross anyone's minds. They don't think too deeply in the matter. It doesn't come up much, anyways.
But then one day, Bruce messed up. Not as Batman, but Bruce Wayne, a father. Now everyone's in the batcave, watching Tim chew Bruce out.
Dick's screaming matches with Bruce is stuff of legend, and also normal, so most have figured out how to tune them out. But this isn't a screaming match. It isn't even a shouting match.
This is Tim tearing into Bruce with pinpoint accuracy: not saying anything untrue, which makes the words dig all the deeper.
Everyone thinks Bruce is going to snap back, but he sits there, cowed. And then, to everyone's (except Alfred's) shock and disbelief, Tim stares him down and says in an absolutely icy tone, "I'm disappointed in you, Bruce." And Bruce just wilts in his chair.
And then he actually apologizes.
Tim - a single dad who works two jobs.
More specifically: Tim, who helped his girlfriend (Steph) through her pregnancy at 15 and looked deeply into pregnancy and child rearing incase Steph wanted to keep the baby, before she decided to put them up for adoption.
Tim, who parented his child (Bruce) as a single parent at 13+
Tim, who is staring at the cloning chamber of his dead best friend(s), suddenly realising this may result in a baby- but jts OK. Because he's prepared.
Robin's are prepared for anything.
And Tim? Tim is fully prepped for a baby. It's ok.
Doesn't matter, in the end. The cloning fails, Kon and Bart return, he finds Bruce. But the idea sits, in the back of his mind... he could be a dad, if he wanted to.