How closely related am I to my cousin if our mothers are sisters & our fathers are brothers?

Question

Hi,
I would like to know how closely my cousin and I might be related, because sharing the same 4 grandparents must make us genetically closer than most cousins. I should clarify that there is no inbreeding. Two sisters from family A married two brothers from family B.
Thanks.

Nothingusefullearnedinschool · Accepted Answer

You would be what some call "double first cousins so 25%, the same as what a person shares with grandparents, aunts, uncles, grandchildren.

http://www.isogg.org/wiki/Autosomal_DNA_statistics

Anonymous · Answer

Maternity cousins (i.e. your mom and your cousins' mon are sisters) proportion 0.5 a similar blood and subsequently, marriage is allowed. Paternal cousins (i.e. your dad and your cousins' dad are brothers) proportion a similar blood and those cousins are like your guy or woman siblings. subsequently, marriage isn't allowed.

Nelson · Answer

Double first cousins One in 8 of your genes is identical.

Sunday Crone · Answer

It is not about close, you are double cousins, meaning your are cousins on both the maternal and paternal lineage.

Topher · Answer

Two of my friends have the same situation. They are first-cousins. I've never heard of double first-cousins.

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How closely related am I to my cousin if our mothers are sisters & our fathers are brothers?

5 Answers