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Cousister 

cou-sis-ter

-noun

Female to female first cousins that are so close they are also like sisters.
My cousister and I share underwear, because we're that close.
Cousister by monk86 October 7, 2010
See ya later, cousinne.
This my cousinne, Tina.
cousinne by Brioni September 8, 2010

cousinlaw 

a cousin-in-law. your cousin's spouse or your spouse's cousin.
Sebouh and Becky are cousins. Rudy is Becky's husband. Sebouh and Rudy are cousinlaws.
cousinlaw by Anthony Gennaro Comé November 3, 2010

Cousinraderie 

A feeling of "comraderie" one feels with one's cousins.
I wish my kids could have the cousinraderie with THEIR first cousins that I had with mine when I was a kid. We spent a LOT of time together, having fun.
Cousinraderie by Kanji_Flufenoff January 11, 2012
My auntie has a boyfriend and his kids are considered my cousinishs

close cousins 

The best friends in the family

Hernandez
naomi and andrew are such close cousins