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Where is the line drawn and it becomes a sin against God? I am having a problem with this because my child is dating my 3rd cousin, and in my heart I feel it is. Marrying your first cousin, while illegal in many states, is not the worst thing you could do. But the situation gets hairy if several generations follow do the same. Among other things, the researchers were able to determine at what point in percent of their genes and third cousins share just over 3 percent. First cousin marriage became less common in the US as the population increased So, it shows that you and your third cousin share a 1/16 relationship to each other. Many people can't even trace back beyond a generation or two, with no.
Generations are shown by alternating stripes of gray and white. People are related with a type of cousin relationship if they share a common ancestor and the most recent common ancestor is two or more generations away from both people.
For example, the second cousin once removed relationship is a second-degree cousin with one removal.
Cousin marriage - Wikipedia
The removal of the cousin relationship is the number of generations the cousins are apart. When the cousins are separated by a different number of generations from the most recent common ancestor, the cousin relationship is removed.
The difference between the number of generations for each cousin is the removal. Note that two people can be removed but be around the same age due to differences in birth dates of parents children and other relevant ancestors.
Unpopular Opinion: Dating Your Distant Cousin Is Fine
If the cousins are removed, the smaller number of generations to the most recent common ancestor is used to determine the degree of the cousin relationship. If one had to go back two generations beyond the parents great grandparents and the other had to go back two or more they would be second cousins  .
This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. December Learn how and when to remove this template message Double cousins arise when two siblings of one family mate with two siblings of another family.
This may also be referred to as 'cousins on both sides.
Double first cousins share both sets of grandparents and have twice the degree of consanguinity of ordinary first cousins. Technically, this does not prohibit marriage to cousins.
The fuller prohibition has come partly from a desire to keep as far as possible away from something that is spoken of with such serious warning in scripture.
Another reason is cultural. As our society has become more numerous and diverse, it has become more repulsive to us to marry close to family. It has also become a joke to put down those who were considered to be from the sticks--that is, rural folks who did not know any better.
But let us consider your particular situation. You refer to your child dating your third cousin.
Cousins usually share a common set of grandparents though it can be only one grandparent and one-half of the genetic pool. Second cousins usually share a common set of great-grandparents and one-fourth of the genetic pool.
Third cousins usually share a set of great-great-grandparents and one-eighth of the genetic pool. However, your child will only have one-half of your genetic pool and would only share one-sixteenth of the genetic pool with your third cousin.
That is a very small amount.