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I'm looking for the adjective that goes with sibling. My sentence would be something like:

The [...] relationship.

So the adjective would be used to denote that the relationship is one between siblings. A native speaker told me it was simply sibling, however, I'm not convinced. I have tried googling for the answer, but it hasn't yielded any results as of yet.

Unfortunately, my Oxford dictionary is having a sleepover at one of my fellow students.

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closed as general reference by MετάEd, J.R., FumbleFingers, tchrist, Mr. Shiny and New 安宇 Sep 4 '12 at 13:11

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

It is, in fact, a sibling relationship. What makes you hesitant to accept this? What did you google for? I just did and found this: google.com/… – Jim Sep 3 '12 at 20:01
"Unfortunately, my Oxford dictionary is having a sleepover at one of my fellow students." Ahem. You don't need your Oxford dictionary to answer this question; if you can access ELU, you can access a dictionary. – J.R. Sep 3 '12 at 21:43
@J.R. Yes, but my dictionary has a list with all related words. Adjective is not found at your suggested website. – BloodPhilia Sep 4 '12 at 10:18
@BloodPhilia: Definition 1(b) (as modifier) ⇒ sibling rivalry. That gives you the meaning you seek. – J.R. Sep 4 '12 at 14:11
up vote 10 down vote accepted

Your native speaker is right about sibling relationship.

If you want to talk about the relationship between brothers, there's fraternal.

Conversely, sororal is used for sisters.

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Awesome, thanks! – BloodPhilia Sep 3 '12 at 20:08
There are some among us who would use "fraternal" in a gender-neutral way too. This is what stops it from being a perfect synonym of "brotherly". – user16269 Sep 4 '12 at 3:02

While it is broader (and can cover relationships outside of the same generation) the term consanguineal reflects common blood relationship

having the same ancestry or descent; related by blood.

It derives from the noun form, consanguinity, meaning

relating to or denoting people descended from the same ancestor:

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Thanks! Although your suggestions are not of the nature I need, very interesting! – BloodPhilia Sep 4 '12 at 10:16

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