Negative-first-cousin-nine-times-removed: great-great-great-great-great-great-great-grandparent or great-great-great-great-great-great-great-grandchild.
My great-great-great-great-great-great-great-grandparent is my N1C9R in theory and my great-great-great-great-great-great-great-grandchild is also my N1C9R in theory.
by KMM128 May 23, 2021