Is Polygonum cuspidatum Youren a younger brother?

You Ren, a giant knotweed, is a younger brother. In the anime "Curse Back to War", the technique of expansion phase is red blood skill, which can sense people connected by blood, so it gives up killing Polygonum cuspidatum, so expansion phase always thinks Polygonum cuspidatum is his own brother, which has always been regarded as a joke. Back to the Curse of War is adapted from the comic book of the same name written by Mustafa. The story takes place in this strange world where the curse exists. The curse is born because of all kinds of negative emotions produced by human beings. The curse of sneaking into people's daily life is spread all over the world, which is the root cause of destroying the world, bringing disaster to mankind and leading to human death.