0C4R

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

My great-great-grandpibling is my 0C4R in theory and my great-great-grandnibling is also my 0C4R in theory.