It was not what they expected; you, being a vigilante. Even Bruce is shocked because how the hell didn't he notice one of his kids being a vigilante? They found out when your mask fell off your face, not because they figured themselves.

"We have to give you some credit for your hiding skills." Dick breaks the silence, Bruce's glare shuts down his children chuckles and turns to you.

"Why didn't you tell us? It's dangerous to hide this kind of thing from us." Bruce says in a harsh tone.