骨肉相连 flesh and blood
Explanation
比喻关系非常密切，不可分离。
It describes a very close, inseparable relationship.
Origin Story
从前，在一个小山村里住着两户人家，他们世代为邻，两家孩子从小一起长大，情同手足。两家大人也经常互相帮助，患难与共。后来，村里闹起了饥荒，很多人家都吃不上饭。其中一户人家更是因为家中孩子多，而无力承担，一家老小差点饿死。另一户人家得知此事后，立即将家中仅剩的粮食分了一半给邻居，帮助他们渡过难关。两家人互相扶持，最终一起走出了困境。他们的故事在村里传为佳话，人们都说他们就像骨肉一样相连，感情深厚，是真正的亲人。
Once upon a time, in a small mountain village, there lived two families who were neighbours for generations. Their children grew up together and were like brothers and sisters. The adults often helped each other, especially during hard times. Later, a famine hit the village, and many families did not have enough to eat. One family with many children was particularly hard hit and was on the verge of starvation. When the other family heard about it, they immediately shared half of their remaining food with their neighbours and helped them overcome the crisis. The two families supported each other and finally got through the difficulties together. Their story became a legend in the village, and people said they were connected like flesh and blood, deeply attached and true relatives.
Usage
形容关系密切，不可分离。常用于形容亲属关系。
It describes a close, inseparable relationship, often used to describe family relationships.
Examples
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他们兄弟二人骨肉相连，感情深厚。
tāmen xiōngdì èr rén gǔ ròu xiāng lián, gǎnqíng shēnhòu
They are brothers, whose relationship is very close.
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患难见真情，这才是真正的骨肉相连啊！
huàn nàn jiàn zhēnqíng, zhè cái shì zhēnzhèng de gǔ ròu xiāng lián a
It's the true blood relationship that shows its value during hard times!