The ranking of children in traditional etiquette: eldest son, eldest daughter-in-law, second son, second daughter-in-law, eldest daughter, etc.

They may pray to nature or God in their hearts to bless their buildings to be successfully completed and stand still; Bless their ships to sail safely after launching; I wish them a prosperous business after opening ... These are not "social contacts", but people are trying to communicate with ghosts and gods and nature. Therefore, we can't just position etiquette in the category of "social interaction".

Note: Etiquette should not be confined to the category of "socializing". The earliest etiquette is ceremony, not "socializing", but people are interacting with ghosts and gods and nature with their hearts.

Moreover, even in modern times, many manners are not social things. For example, the groundbreaking ceremony, the launching ceremony, the opening ceremony and so on, people hold these ceremonies, in fact, they are consciously or unconsciously expressing their reverence and prayer for nature or the god they believe in.