I'm not aware of a Damian in my universe but it's possible I just haven't met him yet. Wasn't even aware of most of my other siblings until I got here.

[Jason's not surprised Jon can see the secret passageways. When he renovated the building, he hadn't considered putting in lead as protection against a Kryptonian's x-ray vision]

And yeah. Don't spread around that we got extra features to this place. The rest of the flock and a few other people know too but that's it.