If uncle means father's eldest brother, you should call her aunt; Moreover, Tongan in Xiamen calls her husband's brother and uncle, so she should be called sister-in-law.

Great-grandson: the son and daughter of a grandson. Great-grandson: the son and daughter of a granddaughter.

Grandchildren: sons and daughters of grandchildren. Great-grandson (great-grandson, great-grandson): Children of great-grandson.

List of nine families:

Grandmother: Grandfather's uncle's wife.

Grandfather, granduncle, granduncle, granduncle, granduncle, granduncle: the son of great-great-grandfather.

Grandmother, grandmother, grandfather, grandmother, grandmother, grandfather, grandmother, grandfather, grandmother: great-grandfather's wife.

From father to uncle, from father to uncle, uncle to uncle, uncle to uncle, uncle to uncle, father: grandfather's son.

Then from father and aunt, then from father and aunt, uncle and aunt, uncle and aunt, mother: grandfather's wife.

Refer to the above? Baidu encyclopedia-kinship terms