What is the relationship between Princess Dragon Seven and Lord Dragon Five and the Four Seas Dragon King?

The relationship between Princess Dragon Seven and Lord Dragon Five and the Dragon King of the Four Seas: Princess Dragon Seven and Lord Dragon Five are cousins, father and daughter with the Dragon King of the East China Sea, and uncles with other three dragon kings. Princess Dragon Seven is the seventh princess of the East China Sea Dragon King, and dragon five is actually the fifth son of the South China Sea Dragon King. So Princess Dragon Seven and Master Dragon Five are cousins, father and daughter with the East China Sea Dragon King, and uncles with the other three sea dragon kings.