Sibling's great-great-great-granddaughter.
My great-great-great-grandniece is a good person.
Sibling's great-great-great-granddaughter.
great-great-great-grandniece.
Half-sibling's great-great-great-granddaughter.
My half-great-great-great-grandniece is a good person.
Spouse's great-grandnephew's wife.
My co-great-grandniece-in-law is a good person.
Spouse's great-grandnibling's wife.
My co-great-grandniece-in-law is a good person.