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Dude imagine-
For some reason Danny gets adopted by the bat fam right? But they don't know he has powers and he doesn't want them too. But he still uses them all the time out of habit.
-completely silent, pops up out of nowhere because of his invisibility, goes through walls and ends up getting to different rooms way faster then the rest of them.
They are confused how this random civilian child is sneaking around without them knowing how he does it and when they ask him about it he panics, cuz he doesn't want them to know he has powers so he blurts out the first thing he can think of-
"there's secret tunnels all through the manor."
They for some reason believe him(barely) because how else would he be able to get around like that?
But he refuses to tell them where they are or how he found them (because they don't exist) and they're all confused why they never found any tunnels when they explored the manor over the years.
They're also probably embarrassed that none of them, as the 'worlds greatest directive family' , could find these so called tunnels so they all look in secret separately from each other.
Eventually they decide that Danny has to be lying because none of them can find these tunnels.
Until Jason, who knows Danny is a halfa (and is maybe also one himself) tells them that the tunnels are real and that he uses them too. And he either uses his ghost abilities too if he is a halfa or he gets Danny to use his powers on him too.
And at this point the family has seen them appear and disappear, together AND separately, as soon as they're not looking, even in rooms where someone is blocking the only entrances.
Which sends the family into a frenzy,
- Tim hasn't slept in weeks, he has multiple maps and blueprints of the manor strewn around his table with empty coffee cups and a repurposed crime bulletin board.
- Dick and Steph have accepted defeat and have taken to begging Danny or Jason for the location of the tunnels. Even bringing up the pranking opportunities they could have, which they come to regret when Jason and Danny use their ideas on them and the rest of the family.
- Cass is frustrated and a little jumpy that she can't find these tunnels and that they can sneak up on her at any time, so they take pity on her and let her in on the secret. They also make sure she always know when they approach her so they don't freak her out.
- Duke has decided to stay out of it but they occasionally find him looking around for the tunnels when he thinks no one's around.
- Damien can't stand that they know something about their house that he doesn't and immediately pesters Bruce about it and interrogates everyone. He even considers joining Tim before deciding that it would be shameful to find the tunnels with his help.
- Bruce is confused because he figures he would know about any tunnels in his own home since childhood, but ultimately he believes that they're real because Danny, Jason, AND now Cass seem to know where they are. He is half parts disappointed they're so difficult to find, because the childish side of him would have enjoyed playing in them when he was younger, and half parts relieved, because he doesn't think he could handle all his kids popping in and out of every crevice in the manor. Though he does ask Alfred if he knew about them, to which he cryptically responds that he knows exactly how they're getting around, but he refuses to elaborate further. The more Bruce thinks about it he comes to realize that it makes so much since that Alfred knows, and he assumes that is how he is always getting around the manor so quickly undetected.
- Alfred knows that Danny (and maybe Jason) is a ghost because he saw him either disappear or appear out of thin air and talked to him about it. Once everyone knew he knew about what was going on they badgered him for answers but he felt it would be disrespectful and hurtful to Danny to 'out him' so to speak before he was ready, and he figured that they were just having harmless fun.