Grandparent's parent.
Great-grandparent.
A grandparent of one's spouse.
My grandparent-in-law is a good person.
Spouse's grandparent.
grandparent-in-law.
Great-great-great-great-great-great-great-great-grandparent.
My 9X-grandparent is a good person.
My 2X-grandparent is a good person.
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