0C7R

Zeroth-cousin-seven-times-removed:
1- great-great-great-great-great-grandpibling (great-great-great-great-great-grandparent's sibling)
2- great-great-great-great-great-grandnibling (sibling's great-great-great-great-great-grandchild)

My great-great-great-great-great-grandpibling is my 0C7R in theory and my great-great-great-great-great-grandnibling is also my 0C7R in theory.