What are the four-word idioms that describe good sisters and brothers?

Even branches are connected with qi, feelings are the same as brothers, qi is the same as roots, pulse is the same as qi, brotherhood and so on.

Ang Lee Zhang Dongkai

Interpretation: It is a metaphor for the intimate relationship between brothers and sisters or brothers.

Source: Lu Chunqiu mastered: "So, parents are to their children, and children are to their parents. They are one and two, with the same spirit and different interests. "

feel a kinship with sb

Interpretation: Brothers: Metaphorical brothers. Deep friendship, as close as brothers.

Source: Tang Lihua's "Hanging the Ancient Battlefield": "Who has no brothers?"

Tang junlin

Interpretation: It is a metaphor for the brotherhood of brothers and sisters.

Source: Zhou Liangxing of the Southern Dynasties wrote thousands of words: "The Kong Huai brothers are connected with each other."

One pulse with the same qi.

Interpretation: Point out homology. Refers to the intimate relationship between brothers and sisters.

Origin: "The Story of Awakening Marriage" Origin: "Brothers were born of the same father and mother, but they were separated in order. It was originally a vein."

Brotherhood

Interpretation: Brothers: Metaphorical brothers. Metaphor brother's feelings.

Source: Tang Lihua's "Hanging the Ancient Battlefield": "Who has no brothers?"