Sangmen refers to parents or relatives.

Sangmen represents the elders in the family, which may be parents or other elderly family members, such as grandparents, grandparents, uncles and so on.

Sangmen, one of the four-pillar gods, is an unlucky god, together with the brave warrior and Hangke, who is in charge of mourning. One of the so-called Chen Cong by ancient astrologers. I think one year old and twelve years old follow the good gods and evil spirits.

Word source

It turned out to be shamanism (shamanism here refers to shamanism in primitive society, not shamanism in Qing Dynasty), an astrological term used for divination. Because Sangmen is one of the stars in Sangmen divination, Sangmen is also the abbreviation of Sangmen divination.

In ancient times, people thought that a person's luck was like a watch. When the pointer went to different positions, people's fortune would have different performances. Sangmen reflects the influence of a person's printing pattern in different periods and under different circumstances on the future.