Are 4th cousins blood related
After taking a consumer DNA test, you may have multiple DNA matches that tell you that you have many fourth and sixth cousins. It might be confusing and appalling at the same time. But, are fourth cousins blood-related?
To answer the above question, let’s find out what fourth cousins are? You and your fourth cousins share the same great-great-great grandparent. It means you and your 4th cousin are three generations away from your common ancestor.
There are DNA databases available like 23andMe, and Ancestry DNA. They provide you with an extensive list of potential candidates that can be your third, fourth, fifth, and even sixth cousins. But the point is their data can be asymmetrical or unbalanced.
So are your fourth cousins blood-related? Do you have a blood bond with your fourth cousin? To determine if you are either blood related to your fourth or sixth cousin, we have to analyze the actual amount of DNA you share with your cousin.
To measure the amount of shared DNA, we use a term called “Centimorgan” and is used by all DNA databases. The thing is, online tools mostly explain your family chart under first, second, third, fourth, fifth, and sixth cousins.
But, they do not consider the fact of “once removed”. So technically, according to these online tools, your fourth or sixth cousins can be your second and third cousins.
The possibility that your fourth and sixth cousins can be your second and third cousins if removed once or twice creates extensive research opportunities. Based on this information, you can look up and organize your family’s DNA that will ultimately help you to look for your common ancestors.
Are 4th cousins considered family?
Yes, technically, they are your family, but they are very distantly related. It also depends on your concept of “Family.” Fourth cousins are actually on the most outer limits, and you will hardly know each other.
You and your fourth cousins share a great-great-great grandparent, which is a very distant relation. Most of the people who have families usually have a concept of sharing their lineage up to a great grandmother, and that is why most people hardly consider their fourth cousins as their family.
Also, your fourth cousins share the least amount of DNA with you, so they become distant and indifferent, and there are hardly any people that consider fourth cousins as their family. But technically, yes, they are blood-related to you because you both share a great great great grandparent.
Are 4th cousins really related?
You share at least 0.20% DNA with your fourth cousin. As compared to first, second, and third cousins, your fourth cousins are your most distant relatives. Why? Because you and your fourth cousins are four generations away from your common ancestor.
On the other hand, you share twenty percent of your DNA with your first cousins and 1.5 percent with your second cousin. You also share 0.78 percent DNA with your third cousin.
So, technically you are related to all your cousins no matter how many generations far, but you would be so indifferent, and you may never meet each other as well in your whole lives.
Are 4th cousins distant?
Yes! Fourth cousins are very distant from each other. They are four generations away from their common ancestor. Let’s understand this with an example. Suppose you and your cousin John are first cousins. That will mean you share the same grandparent.
Now, if you and John are second cousins, then you will share the same great grandparent. Similarly, if you and John are third cousins to each other, you will share the same great-great-grandparent. So, if you and John are fourth cousins, then you will share a great-great-great grandparent if none of the cousins is removed.
So from the above example, you can clearly estimate how distant your cousins are based on a common ancestor.
Is my 4th cousin inbred?
According to the research, almost 0.2 percent of marriages in the U.S are with their second cousins. It means 2,50,000 people in the U.S are involved in cousin relationships and cousin marriages.
For cousin marriages, there is a specific term used in research called “Consanguinity”. The literal meaning of this word is “Inter-relationship”. Now to measure consanguinity, there is a specific coefficient. This coefficient is called the “inbreeding coefficient”.
The higher the inbreeding coefficient, it will explain two individuals are more closely related to each other. The consanguinity coefficient for first cousins is 0.00625, whereas, for the second cousins, it is 0.00156.
So by calculating these consanguinity coefficients, you can estimate the inbreeding of your fourth cousins as well.
What are the 4th cousins once removed?
Let’s first understand what the term “removed” means. The term removed is used when your cousins share the same common ancestors, but you are not the same generations away from that common ancestor.
Now, what does it mean when someone says he is my fourth cousin once removed? As we know now, fourth cousins share a great-great-great grandparent, so a fourth cousin once removed means that he is either the offspring of your fourth cousin. It can also mean that your fourth cousin, once removed, is the fourth cousin of your parents.
The common ancestor is used as an origin to describe any cousin relationship type; first, second, third, and fourth. Then an estimation of a removed cousin is estimated by the number of generations or the generational level.
Are 4th cousins allowed to marry?
Yes! It is completely legal in all countries to date and marries your fourth cousins. Biologists say that you share the least amount of DNA with your third and fourth cousins, and that is why they are the best people if you want to carry your family hereditary.
There are only restrictions regarding first-cousin marriages. As first cousin marriages mostly lead to genetic disorders in children, the U.S bans first-cousin marriages in twenty-four states, while other states have their own rules.
For example, in Arizona, you can only marry your first cousin if you are more than fifty-two or only if one of the partners is infertile.
How common are 4th cousins?
Fourth cousins are very distantly blood-related as compared to first, second, and third cousins. That is why we hardly see fourth cousins interacting with each other or still in touch with each other.
Most of the families do not maintain such long genetic links, as it is hard to do in this fast-moving century. Most of the people only consider their families to have one common origin, their “Grandparents.”
4th cousin dating
It is legal to date your fourth cousin in all countries over the world. Though fourth cousins are blood-related to you, they share a very small amount of DNA with you, so there are no terrifying chances for your children to be born abnormally.
4th cousin married
Though it is entirely okay to marry your fourth cousins, you will hardly know people that are married to their fourth cousins. Even if they are married, they may not even know that they are fourth cousins to each other. Why? Because they are so distant from their common ancestors as they share a great-great-great grandparent.