What is a first cousin once removed? Your kinship terminology questions answered

Isn't it exciting to find out you have a historical icon in the far-off depths of your family tree? But when you brag to your friends, what do you call this famous ancestor? What do kinship terms actually mean?

Confusing, right?

It doesn't have to be. If you're familiar with the system used in designating these relationships, you'll see there's a consistent formula to the kinship titles we assign to various family members. So the next time you're researching your family history, and you ask what relation someone in your family tree is to you, it should be straightforward to work out.

In English-speaking societies, family relationships are classified based on gender, generation, consideration of consanguinity (direct descendants) and immediate affinal (in-law) relationships. For example;

Our common familiarity is with immediate family and direct lines, so brother, sister, cousins, aunts/uncles and (great) grandparents. It can start to get confusing when differentiating between the "degrees" and "removals" of cousins. We're here to help you make sense of the systems of kinship with this handy guide.

First, second and third cousins

The ordinals in this system, "first cousin", "second cousin", "third cousin", all describe the degree of the cousin relationship or the number of generations to their closest ancestor. For example, your second cousin is a person you share great-grandparents with and is not your direct sibling. It's easier to think of what your shared ancestors would call you both - if your closest shared direct ancestor is your great-great-grandparents, and they call you both "great-great-grandchildren," then you have no removal. Your genealogical relationship is third cousins.

Once, twice, thrice removed

When the cousins are not in the same generation then they are "removed". "First cousins once removed" declares that either one of you is one generation away from being first cousins. For example, if your first cousin has children, they are your first cousins once removed. The closest common ancestor shared are your grandparents but are "once removed" from the level of first cousin (held by their parents).

Here is where it can get confusing. There are two instances in your family tree that can be considered 'once removed'. This is a reflection of what cousins refer to each other as. Up until now, each relationship in your family tree has inverse titles for each other. You are your aunt's niece, nephew, or nibling; you are your great-grandparents' great-grandchild.

However, cousins refer to each other as cousins. Because of this, your first cousin's child is your first cousin once removed and you (the parent of their second cousin) are also their first cousin once removed - so you each refer to each other in the same way. This means that the child of your first cousin and the parents of your second cousin are both "first cousins once removed", despite each of them being generations apart.

Yes, it's tricky to wrap your head around. Here is a terminology breakdown to make things simpler to understand.

• First cousins are non-siblings that share grandparents
• Second cousins are non-siblings that share great-grandparents
• Third cousins are non-siblings that share great-great-grandparents
• First cousins once removed are two people for whom the first cousin relationship is one generation removed
• First cousins twice removed are two people for whom the second cousin relationship is two generations removed

And if you think this family naming convention is confusing, at least it is formulaic. In Chinese culture, individual terms are used for every relationship.

So, now you know what to call your distant relations, the below video should make more sense now.

Grow your family tree for free

One of the easiest ways to make sense of all the different branches of your family tree is to store them on Findmypast's free online builder. With it, you can see family relationships plotted out neatly in one place. Plus, each relative gets their own profile to fill with stories, photos, records and memories from the past. And when you've run out of new relatives to add your tree, our clever hints can introduce you to the ones you know nothing about.

But most importantly, if you need an extra hand with defining your family relationships, you can try our kinship calculator. To get there, click the 'view full profile' when looking at your focus person.

From there, scroll down and you'll find a button like this.

Clicking this button will let you type in any other person on the family tree and it will then calculate the relation between the two people. So if you've finished this article still in the dark, fear not - we have the tools to make sure you'll never get lost with kinship terminology again.