Step Great-Grandmother 

1. The grandmother of one's stepmother or stepfather.

2.The stepmother of one's grandmother or grandfather.

3.The mother of one's grandmother's husband or grandfather's wife; but not their biological great-grandmother.

His Step Great-Grandmother was the wife of his Great-Grandfather.

Step Great-Grandmother by Stepman December 11, 2017

step-great-grandmother

1. The mother of one's stepgrandparent.
2. The stepmother of one's grandparent.

My step-great-grandmother is a good person.

step-great-grandmother by Elivaldeq November 24, 2019

step-great-grandmother

1- Stepgrandparent's mother.
2- Grandparent's stepmother.

My step-great-grandmother is a good person.

step-great-grandmother by QWP998756 October 15, 2021

step-great-grandmother

1- Stepgrandparent's mother.
2- Grandparent's stepmother.

step-great-grandmother.

step-great-grandmother by Simaduria July 27, 2024

step-great-grandmother-in-law 

Spouse's step-great-grandmother.

step-great-grandmother-in-law.

step-great-grandmother-in-law by Simaduria July 27, 2024

step-great-great-grandmother 

1- Step-great-grandparent's mother.
2- Great-grandparent's stepmother.

My step-great-great-grandmother is a good person.

step-great-great-grandmother by User655 July 25, 2021

step-great-grandfather

1. The father of one's stepgrandparent.
2. The stepfather of one's grandparent.

My step-great-grandfather is a good person.

step-great-grandfather by Elivaldeq November 24, 2019