7th Cousin vs. First Cousin

Attribute	7th Cousin	First Cousin
Relationship	More distant relative	Closer relative
Genetic similarity	Less genetic similarity	Higher genetic similarity
Shared ancestors	Shared ancestors further back in the family tree	Shared grandparents or great-grandparents
Legal implications	No legal implications	Potential legal implications in some jurisdictions

Definition

First cousins are the children of siblings, while 7th cousins are related through a common ancestor who is seven generations back. This means that first cousins share a set of grandparents, while 7th cousins share a set of great-great-great-great-great-great-grandparents.

Genetic Similarity

First cousins share about 12.5% of their DNA, which is the same amount shared by any two siblings. This genetic similarity is due to the fact that they have a common set of grandparents. On the other hand, 7th cousins share a very small percentage of their DNA, typically less than 1%. This is because the genetic connection between them is much more distant.

Familial Relationship

First cousins are often close in age and may have grown up together, attending family gatherings and celebrations. They may have a strong bond and consider each other more like siblings than cousins. In contrast, 7th cousins are likely to be much more distantly related and may not even be aware of their familial connection. They may not have any shared memories or experiences growing up.

Legal Implications

In many cultures and legal systems, marriage between first cousins is considered taboo or even illegal due to concerns about genetic disorders in offspring. However, marriage between 7th cousins is not typically subject to the same restrictions, as the genetic relationship is so distant that the risk of genetic disorders is minimal.

Family Tree

When looking at a family tree, first cousins are typically shown as siblings of each other's parents, with a direct line connecting them to their shared grandparents. On the other hand, 7th cousins would be located much further back on the family tree, with multiple branches and generations separating them from their common ancestor.

Genealogical Research

Tracking down information about first cousins is usually easier than researching 7th cousins, as the closer familial relationship means that there are likely more records and documentation available. First cousins may have shared family stories, photos, and documents that can help in genealogical research. In contrast, finding information about 7th cousins may require more extensive research and digging through historical records.

Emotional Connection

First cousins often have a strong emotional connection due to their shared family history and experiences. They may have a sense of loyalty and support for each other, similar to that of siblings. On the other hand, 7th cousins may not have any emotional connection at all, as they may not have even met or communicated with each other before discovering their distant familial relationship.