Intimacy of three good brothers and sisters means that the relationship between three brothers and sisters is very good, which can be said to be intimate. Three brothers and sisters refer to three brothers and sisters whose father and mother are the same. The so-called "three brothers and sisters" refers to the three sons and daughters born to the father and mother, of which the boy is the oldest and the girl is the youngest. The so-called "three brothers and sisters" are not three brothers and sisters. Three brothers and sisters are brothers and sisters of the same father and mother. They can be two men and one woman, or one man and two women. But in any case, the three brothers and sisters are all inherited by the same blood gene.