Brothers, friends and brothers treat each other as guests: brothers are friendly to brothers, and brothers are respectful to brothers. Describe how brothers love and respect each other.
Brother is fat, brother is thin: as the old saying goes, brothers love each other and fight hard in the face of difficulties.
Brother's death and brother's death: it originally meant that brother died and brother succeeded to the throne as king. Later, it also refers to the younger brother taking over the position and career of his brother.
Brothers don't agree with the wall and are insulted by the outside world: quarreling; Wall: curtain. Although the two brothers quarrel at home, they can resist the bullying of outsiders. Although there are differences within the metaphor, they can unite to deal with foreign aggression.
Brother Shovel: Shovel: Hit. An argument between brothers is also a metaphor for internal strife.