Who are slender man brothers?

Slender Man does not have official "brothers" in the traditional sense, as he is a fictional character from internet folklore and Horror stories. However, within the Slender Man mythos, there are various other creatures and characters that are sometimes considered to be part of the same universe or associated with him, such as the Rake, Smile Dog, and Jeff the Killer. These characters often share similar themes of horror and the supernatural, but they are not directly related to Slender Man as siblings.