Malcolm Rivera
Half-first cousins are people who share only one grandparent. Their parent is a half-sibling to one of your parents. If your grandmother or grandfather had a child with someone who was not your other grandparent, then the children of their offspring will be your half-first cousins. Half-first cousins share around 50% of the usual DNA they would have with first cousins.
| Characteristics | Values |
|---|---|
| Shared DNA | Around 50% of the usual DNA shared with first cousins |
| Shared grandparent | One grandparent |
| Parent relationship | Half-sibling |
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What You'll Learn
Half-first cousins share one grandparent
Half-cousin relationships can be extended through all generations. For example, you can be half-first cousins with someone, but both of you can be full second cousins with a third person because you share the same great-grandparents.
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Half-first cousins share around 50% of the DNA of first cousins
A half-first cousin is someone with whom you share only one grandparent. Their parent is a half-sibling to one of your parents. This means that half-first cousins share around 50% of the DNA of first cousins.
To put it another way, if your grandmother or grandfather had a child with someone who was not your other grandparent, then the children of their offspring will be your half-first cousins. This is because the parents of each half-first cousin are also half-siblings.
It is thought that first cousins share around 12.5% of DNA, meaning half-first cousins share approximately 6.25%. However, DNA doesn’t follow strict averages, so half-first cousins can indeed share the same amount of DNA (even more in some cases) than full first cousins.
It's also worth noting that you can be half-first cousins with someone, but both be full second cousins with a third person because you share the same great-grandparents.
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Half-first cousins' parents are half-siblings
A half-first cousin is someone with whom you share only one grandparent. Their parent is a half-sibling to one of your parents. If your grandmother or grandfather had a child with someone who was not your other grandparent, then the children of their offspring will be your half-first cousins.
The relationships between half-siblings' parents don't affect their cousin relationships. This extends through all generations. For example, you can be half-first cousins with someone, but both of you can be full second cousins with a third person because you share the same great-grandparents.
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Half-first cousins can be full second cousins with someone else
Half-first cousins are people who share only one grandparent. Their parent is a half-sibling to one of your parents. For example, if your grandmother or grandfather had a child with someone who was not your other grandparent, then the children of their offspring will be your half-first cousins.
Half-first cousins can also be full second cousins with someone else. This is because half-first cousins share the same great-grandparent, and therefore are full second cousins.
To explain this further, let's look at an example. Imagine you have a grandmother who is not related to your cousin. However, your grandfather is related to your cousin. In this case, your first cousins are also your half-first cousins. Now, let's say that your grandmother has a sibling. This person is your great-aunt or great-uncle. If your great-aunt or great-uncle has children, they will be your second cousins. Since you and your half-first cousin share the same great-grandparent, you are both full second cousins to the children of your great-aunt or great-uncle.
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Half-first cousins can be the result of a grandparent remarrying
Half-first cousins are the result of a grandparent remarrying. If a grandparent marries once, has a child, then marries again and has another child, these siblings are half-brothers and/or sisters. In turn, the grandchildren of these half-siblings are known as half-first cousins.
Half-first cousins share one grandparent, rather than both like regular cousins. Their parent is a half-sibling to one of your parents. For example, your grandmother might not be related to you, but your grandfather is. So, your first cousins are your half-cousins as a result.
Half-cousins share around 50% of the usual DNA they would have with first cousins. It is thought that first cousins share around 12.5% of DNA, meaning half-first cousins share approximately 6.25%. However, DNA doesn’t follow strict averages, so half-first cousins can indeed share the same amount of DNA (even more in some cases) than full first cousins.
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Frequently asked questions
A half first cousin is someone with whom you share only one grandparent. Their parent is a half-sibling to one of your parents.
Half first cousins share around 50% of the usual DNA they would have with full first cousins. It is thought that first cousins share around 12.5% of DNA, meaning half first cousins share approximately 6.25%.
Yes, you can be half first cousins with someone, but both of you be full second cousins with a third person because you share the same great-grandparents.
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