im fully convinced that every single member of the wayne household has a very distinct laugh.
Bruce has the billionaire chuckle it's unfortunately super effective on anyone who has a net worth lower than 50 million. Even the members of the JL (that one rare time they managed to make The Batman laugh) get psychically airdropped stock images of private jets and yachts (the only one who knows how to counter it is Oliver).
Just with his smile Dick's can warm your heart, imagine him full-on laughing. It doesn't change even when he's out as Nightwing: many civilians who experienced the vigilante laugh reported feeling comforted and safe even in highly stressful situations.
Jason has the most devilish cackle any human has ever heard. He sounds like he's kicking the curb a second time and unfortunately for anyone around him he's a Hitter: im talking shoulder slaps, shoving and arm-punching.
Tim inherited a watered down version of the billionaire chuckle. If something makes him laugh and he's in front of strangers he'll just let out an amused huff, not giving the person the satisfaction of making the CEO of W.E. laugh. Mainwhile with his friends and family he's less cagey and will let out a bunch of soft giggles on occasion.
Damian looks constipated. That small child is trying so bad to show some decorum by stopping his laughter that he looks like he's about to implode. The very rare times he loses composure he'll let out a mortifying snort, followed by a grimace aimed at himself.
Steph's laugh is very similar to Jason's, so they're extremely dangerous together for anyone in their vicinity. However Jason lacks the wheezing part that Stephanie has.
Cass has a very silent laugh often just showing her amusement by smiling, while Duke's is full of adorable giggles and snorts.
I'm here for Steph and Jason's similarities yet again