It is part of the script of the WWE when it was called the WWF.The Undertaker supposedly didn't rescue Cain from a fire when they were young and Cain is still angry. That is the storyline which is for the show and fake of course.
In the wrestling world, Kane is Undertaker's half brother.
kane
kane enimies are his brother undertaker
his brother Kane and makind
Kane is the young borther of Undertaker. And that is true.
no.
yes
kane
the undertaker
Kane they grew up together. No, they didn't, and Kane is not his real brother.
kane or Paul Bearer
Yes, they are infact blood brother's.