Our fathers are brothers and our mothers are sisters

Have you ever known of anyone that is in the same situation as we do? I am trying to look for some answers on the internet and I hope I found the perfect answer to this question. Obviously, this case of family relationship is unusual, so finding more about it is so interesting to me. I even came to a point of doing the math to calculate the DNA transfer percentage to fully explain the situation (excluding the deeper genetics regarding the chromosomes part and the other mutation probabilities haha!). Well, are you curious too about what do we call this? Let's know some history first and breakdown some factors..

Dimaano - Oyco boys

The Story

We have known each other as cousins since birth and haven't yet checked any other details regarding it since it is not normal to so lol. Just recently while talking about random stuff with each other, a point was raised that given both our parents were siblings a question popped out that "Hey, what do specific relationships do we have then?" So after that, a lot of follow-up questions were formed and related situations brought up.

The Similarities

Both our side and theirs have 3 male siblings and had one miscarriage incident that was most likely males as well. Our ages are close enough to each other that each sibling has his match to the other. There were some instances also that we were mistakenly identified as the brother of our "cousins".

The Probabilities

Literally speaking, we have a relationship of less than brothers, but more than cousins. But what do we call that? Or what category does it belong to the closest if it has no specific relationship name? Let us bring in the probabilities:

1. Identical twins share the same DNA at 100%

2. Parents/Siblings share the same DNA at about 50%

3. Grandparents/Child, uncle/aunt, nephew/niece, and half-siblings share the same DNA at about 25%

4. 1st cousins share the same DNA at about 12.5%

[And so on..]

Where do we fit

Doing that math in advance, of course, we cannot surpass the 50% border and I am pretty sure we cannot go lower than the 12.5% minimum too. So does that mean we fall in the 25% automatically?

Then I stumbled on a term that they call "double first cousins" which they say our relationship falls into. To make it simpler for you, since half-siblings fall into the 25% bracket, double first cousins have higher chances of getting more similar DNA (chances of mutation) since the sources are more familiar. And since we can just approximate everything unless full examinations happen, yes, we fall to the same bracket.. The 25% DNA share.

If you cannot see the video above, click HERE for it

So as a little challenge to spice things up a bit after knowing more of ourselves, can you tell whose brother is whose in the photo?

Whose brother is whose challenge