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English Answer:
No, Kane and Undertaker are not brothers in real life. They are both professional wrestlers who have portrayed the characters of siblings in the storyline of World Wrestling Entertainment (WWE). Kane, whose real name is Glenn Jacobs, and Undertaker, whose real name is Mark Calaway, are separate individuals with no familial connection. Their on-screen relationship as brothers was a creative decision made by WWE to enhance their storyline and add depth to their characters. In reality, they are colleagues and have had a long history of working together in the wrestling industry.

Chinese Translation:
不，Kane 和 Undertaker 在现实生活中并不是兄弟。他们都是职业摔跤手，在世界摔跤娱乐公司（WWE）的剧情中扮演了兄弟的角色。Kane，本名Glenn Jacobs，和Undertaker，本名Mark Calaway，是两个独立的个体，没有家庭联系。他们在屏幕上作为兄弟的关系是WWE为了增强剧情和深化角色而做出的创意决定。实际上，他们是同事，并且在摔跤行业中有着长久的合作历史。

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The Undertaker's Relationship to Kane. The legend goes that Kane and the Undertaker are brothers in real life. Not true. They've been portrayed as half-brothers in various story lines, but they're not related.read more >>