What's the name of the grandson's son?

Great grandson. Great-grandchildren are the fourth generation, and great-grandchildren refer to the kinship between the two generations, that is, the sons of grandchildren. In addition, the great-grandson is equivalent to the great-grandson in a sense, but it is also slightly different from the great-grandson. Great grandchildren refer to the fourth generation from now on. "Grandchildren" and "great-grandchildren" are only aimed at the elderly, and the living elderly are the first generation. A son (the second generation) marries and gives birth to a third generation of children, which is called "grandson", and a grandson grows up and marries and gives birth to a fourth generation of children, which is called "great grandson". Address refers to the forms of address people use with each other in daily communication. In daily life, address should be cordial, accurate and standardized. The correct and proper address reflects the degree of respect or intimacy for each other.