great-great-great-grandmother-in-law
Spouse's great-great-great-grandmother.
My great-great-great-grandmother-in-law is a good person.
great-great-great-great-grandmother
Great-great-great-grandparent's mother.
My great-great-great-great-grandmother is a good person.
great-great-great-grandmother
Great-great-grandparent's mother.
My great-great-great-grandmother is a good person.