Is Brother Blood Trigon's son in the comics?

Yes, in the comics, Blood Raven's brother is indeed his brother.

Some of the dark wizards who are looking for a new source of power might target Harry. They might think that by capturing or controlling him, they can access the powers of Trigon. There could also be entities in other dimensions that see Harry as a key to opening portals between worlds and want to use him for their own malicious purposes.

Well, one possibility could be that Harry has to deal with the dark and chaotic powers inherited from Trigon. He might struggle to control these powers while also facing the threats in the wizarding world. Maybe he discovers a new form of magic related to Trigon's realm.

No, the Joker is not Batman's brother in the traditional comic storylines. They have a complex adversarial relationship, but not a familial one.

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.

Yes, in some comic storylines, the Joker is depicted as a twisted and dysfunctional brother figure to Batman.

In the comics, Sabertooth and Wolverine aren't brothers. They're fierce enemies with a long history of conflicts and grudges against each other.

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.