The great-great-grandparent of one's spouse.
My great-great-grandparent-in-law is a good person.
Spouse's great-great-grandparent.
My great-great-grandparent-in-law is a good person.
My great-great-grandparent is a good person.
Great-great-grandparent's parent.
My great-great-great-grandparent is a good person.
Great-great-grandparent's parent.
great-great-great-grandparent.