step-great-grandniece 

1- Sibling's step-great-granddaughter.
2- Stepsibling's great-granddaughter.

My step-great-grandniece is a good person.

step-great-grandniece by User655 July 25, 2021

step-co-grandniece-in-law 

Spouse's stepgrandnibling's wife.

step-co-grandniece-in-law.

step-co-grandniece-in-law by Simaduria July 27, 2024

co-grandniece-in-law 

The granddaughter-in-law of one's spouse's sibling.

My co-grandniece-in-law is a good person.

co-grandniece-in-law by Elivaldeq November 24, 2019

co-grandniece-in-law 

Spouse's grandnephew's wife.

My co-grandniece-in-law is a good person.

co-grandniece-in-law by Gerald128 April 7, 2021

grandniece 

Sibling's granddaughter.

My grandniece is a good person.

grandniece by Mr. Jacov November 23, 2019

grandniece-in-law 

1. The granddaughter-in-law of one's sibling.
2. The granddaughter of one's spouse's sibling.

My grandniece-in-law is a good person.

grandniece-in-law by Elivaldeq November 24, 2019

grandniece-in-law 

1- Grandnephew's wife.
2- Spouse's grandniece.

My grandniece-in-law is a good person.

grandniece-in-law by Gerald128 April 7, 2021