Your second cousin if you share the same great-grandparents. Edit: Ugh, this gets confusing. I was mistaken. I'd originally included the once-removed, but that

Your second cousin if you share the same great-grandparents. Edit: Ugh, this gets confusing. I was mistaken. I'd originally included the once-removed, but that appears to be incorrect. Or I'm still mistaken. :) A first cousin once-removed signifies one person's grandparent is the other's great-grandparent. Perhaps this cousin chart would help: https://en.m.wikipedia.org/wiki/Cousin#Relationship_charts https://en.m.wikipedia.org/wiki/Cousin#Relationship_charts Just plot yourself and the cousin-in-question by where your shared nth-grandparent lies.