What is first cousin once removed mean?

Have you ever heard the term “first cousin once removed” and wondered what it means? This term can be confusing for those who have only recently started looking into their family’s genealogy. In this blog post, we’ll explain what “first cousin once removed” means and how it impacts your family tree. Let’s get started!

A “first cousin once removed” (FCOR) is a relative that is one generation higher or lower than a first cousin. If you have an FCOR, it means that you share one grandparent with that person. For example, if your father’s brother has a child, then that child would be your first cousin once removed. In other words, they are the children of your parent’s sibling—your first cousins—but they are one generation away from you instead of being in the same generation as you. The relationship is referred to as “once removed” because there is one generation between you and them.

An FCOR can also refer to a first cousin who is older than you or younger than you by more than one generation. For example, if your great-aunt had a child before you were born, then that child would be your first cousin twice removed—not just once removed like the previous example. Similarly, if your great-grandfather had a grandchild after he passed away, then that grandchild would be your second cousin once removed—not just simply called “second cousins” like two people who share two grandparents with each other. It’s important to understand how many generations separate two relatives when referring to them as an FCOR; otherwise, the terminology can become confusing quickly!

FCORs can be used to help trace back through family lines when trying to piece together someone’s genealogy. By looking at an individual’s parents’ siblings’ children (their FCORs), researchers can uncover long-lost relatives or find out more about their family history. This type of research can help someone discover new details about their ancestors and learn more about themselves in the process!


At its core, understanding what “first cousin once removed” means is relatively straightforward—it simply refers to relatives who are one generation higher or lower than first cousins but still share at least one grandparent with each other. However, this terminology does become more complicated when trying to explain relationships that involve multiple generations between two individuals.

Nevertheless, understanding how FCORs play into genealogical research can help both amateur and professional researchers uncover new information about their ancestors and discover long-lost relatives along the way!


Q: How can I find out more about my first cousins once removed?

A: There are a number of online resources that you can use to learn more about your FCORs. One popular option is family tree websites like Ancestry, which offers extensive search options and detailed information on individuals within their database. You can also talk to older family members who may have more information about your FCORs and their history. And of course, talking to an experienced genealogist or professional researcher can be a great way to learn more about FCORs and how they can help you in your own research efforts.

Q: How can I use FCORs to help me research my family history?

A: There are a number of different strategies you can use when working with FCORs in your family tree research. One approach is to examine the relationships between all of your relatives, looking for overlapping generations or shared grandparents that may indicate that you have a FCOR. Another strategy is to start with one of your known relatives and trace back through their ancestors, looking for shared grandparents or other relatives along the way who could be your FCORs. Ultimately, there is no right or wrong approach when it comes to researching your family history—the most important thing is to stay organized, keep track of your findings, and be patient as you work to uncover new information about your ancestors.