Dove Occupying Magpie's Nest

"Book of Songs·Zhaonan·Magpie's Nest": "Wei magpie has a nest, and Wei dove lives in it." According to the dictionary, "dove occupying a magpie's nest" is a metaphor for occupying someone else's house or occupying someone else's position. Between the two sisters Qin Wei and Qin Qiang, who is the dove and who is the magpie? PS: Darkness leads to Yu Xiang, the story of falling in love and killing each other with his sister~Shen