# What is expected shared cM of double third cousins?

Relationship data from Tim Janzen

Relationship Range Expected
First cousins once removed 220-638 cMs 444 cMs
Second cousins 86-426 cMs 222 cMs
Second cousins once removed 19-197 cMs 111 cMs
Third cousins 16-111 cMs 55.4 cMs

## What is a double third cousin?

Report Ad. Their children will be double first cousins, their grandchildren will be double-second cousins, and their great-grandchildren will be double third cousins, and – you guessed it – their great-great grandchildren will be double fourth cousins.

## What do 3rd cousins share?

First cousins share a grandparent (2generations) Second cousins share a great-grandparent (3 generations) Third cousins share a great-great-grandparent(4 generations) Fourth cousins share a 3rd-great grandparent (5 generations)

## How close are 3rd cousins blood related?

What is this? With that said, third cousins who do share DNA only share an average of . 78% of their DNA with each other, according to 23andMe. The exact amount of shared DNA between third cousins can vary, but it is rare for third cousins to share more than 2%.

## How many Centimorgans do cousins share?

First cousins share an average of 12.5% of their DNA; or 866 centimorgans. The expected range of shared centimorgans is 396-1397, according to the shared centimorgan project.

## Are double cousins genetically siblings?

Double cousin is the usual term that is used. But you are as genetically related as half-sisters. Instead of the usual 12.5% of DNA that first cousins share, the two of you share around 25% of your DNA. This is the same amount that you would share with a grandparent, a half sibling or an aunt or uncle.

## How many Centimorgans do half first cousins share?

The amount of DNA shared with a half-first cousin falls between 215-650 cMs (centimorgans). Any amount less than 515 cMs signifies an almost certain half-first cousin relationship, since the DNA shared between two full-first cousins should fall between 515-1300 cMs, approximately.

## Are third cousins considered family?

Your third cousins are blood relatives because you share common ancestors i.e. two of your great-great-grandparents. However, if the cousin relationship is through marriage, then you are not blood relatives.

## Is third cousin too close to date?

In short, yes, it is legal for second and third cousins to marry in the US. Beyong that, state laws get a little more complicated. According to the National Conference of State Legislatures: “Twenty-five states prohibit marriages between first cousins.

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