Sibren- (noun) (pl.) a gender neutral word used to define a group of niece(s) and nephew(s). Sibren is a derivative of the words sibling and children as in my sibling's children. Combined, 'sib' and 'ren' (sibren) make a more convenient way of stating this familial relationship when referring to a group of mixed gender children belonging to your sibling(s).
I want to introduce you to my sibren Naia and William.
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