In many comic versions, it wasn't the Joker. But there are specific alternate story arcs where the Joker is depicted as the perpetrator. It really depends on the particular comic run and creative direction.
Yes, in some comic storylines, the Joker is responsible for the death of Bruce Wayne's parents.
Yes, in many comic storylines, the Joker is responsible for the death of Bruce Wayne's parents.
No, the Joker is not Bruce Wayne's brother in the traditional comic storylines.
Yes, in some comic storylines, Joker is presented as being related to Bruce Wayne in unexpected ways.
The Joker is not Bruce Wayne's brother. Comics typically portray them as having a purely antagonistic dynamic rather than a family connection.
Yes, in some comic storylines, the Joker did kill Thomas Wayne.
The Joker has killed Thomas Wayne in specific comic iterations. This plot twist adds depth and complexity to the characters' relationships and the overall narrative.
No, they're not. Bruce Wayne is Batman and the Joker is his nemesis. They have no direct family relation.
No, they're not. Bruce Wayne is Batman and the Joker is his nemesis, not a brother.
No, they aren't. Bruce Wayne, also known as Batman, and the Joker are not related by blood or family ties in the comics.
They were killed in a random street mugging. A criminal shot them right in front of young Bruce.