In patrilineal society, males are in the middle role, while females are attached, incidental, and on the other side. This is especially obvious in family genealogy; most genealogies only leave the signs and deeds of males; in contrast, females are erased by time as if they were not born, Forgotten. However, the continuation of life requires the union of the two sexes to thrive. When a new generation of males are born and their names are recorded in the genealogy, the existence of the mother (female) has been established. Although females are not on the genealogy, they hint at them during the continuation of their lives. The names on the pedigree all prove the existence of females and are on an invisible side.

          Biological reproduction is the ultimate meaning of survival in nature, a never-ending cycle; human beings preserve the life history of family and travel with signs, leaving a footnote for the moment. In the process of coming down in one continuous line, the most direct and true connection between man and nature is the "beginning" and "end" of life.