The grandson of a grandson is the son of a son, also called the son of a great-grandson, or the grandson of a grandson, or the great-grandson of a son. It's for the fourth grandson, called great-great-grandson.

Great-great-grandson is called Sun Yuan in some places and Bang Sun in others.

Extended data

The kinship stipulated by Chinese law includes husband and wife, parents, children, brothers and sisters, grandparents and grandparents, grandchildren and grandchildren, daughter-in-law and in-laws, son-in-law and parents-in-law, and other collateral blood relatives within three generations, such as uncles, aunts, nephews and cousins.

Relatives are not equal to family members, and people with relatives may belong to different families; Family members have no absolute blood relationship. According to the causes of kinship, relatives can be divided into three categories: spouse, blood relatives and in-laws.