👉 A grand nephew is a sibling who has one or more siblings, often in addition to their parent(s), and who is born before their parents' marriage. This means that they are not directly related to them through blood or marriage. Grand nephews can be cousins, stepchildren, or even distant relatives. They may have different relationships with their parents and grandparents than their immediate family members, but still share a close bond with their biological grandparent(s).