Yes, in some comic storylines, the Joker is presented as a sort of twisted 'brother' figure to Batman, but it's not a straightforward familial relationship.
Yes, in some comic storylines, the Joker is depicted as a sort of twisted 'brother' figure to Batman, but it's a complex and unconventional relationship.
Not typically. While there have been alternate takes and complex story arcs that explore a deeper connection between Joker and Batman, being actual brothers is not a common or core element of their relationship in most Batman comics.
In most comic versions, the Joker and Batman have no direct family relationship. They are more like arch-enemies with a complex adversarial dynamic rather than being related by blood.
It's a bit complicated. Sometimes in comics, there are hints or storylines that imply a strange, dysfunctional 'brotherhood' between Joker and Batman. But it's not a straightforward or definite thing throughout all Batman comic universes.
In the traditional comic storylines, the Joker and Batman are not related by blood. They are adversaries with no familial ties. The Joker is simply one of Batman's most notorious foes.