5X-grandniece

Great-great-great-great-grandniece.

My 5X-grandniece is a good person.

grandniece-by-marriage

Spouse's grandniece.

My grandniece-by-marriage is a good person.

great-great-grandniece-in-law

1- Great-great-grandnephew's wife.
2- Spouse's great-great-grandniece.

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

great-great-grandniece-in-law

1- Great-great-grandnibling's wife.
2- Spouse's great-great-grandniece.

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

8X-grandniece

Great-great-great-great-great-great-great-grandniece.

My 8X-grandniece is a good person.

6X-grandniece

Great-great-great-great-great-grandniece.

My 6X-grandniece is a good person.

3X-grandniece

Great-great-grandniece.

My 3X-grandniece is a good person.