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