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Sororal (adjective)
Of or pertaining to a sister.
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Sororal (adjective)
Related through someone’s sister, e.g. sororal nephew.
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Fraternal (adjective)
Of or pertaining to a brother or brothers.
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Fraternal (adjective)
Of or pertaining to a fraternity.
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Fraternal (adjective)
Platonic or friendly.
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Fraternal (adjective)
Of twins or embryos, produced from two different eggs and sperm, and genetically distinct.
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Fraternal (noun)
A society formed to provide mutual aid, such as insurance.
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Fraternal (noun)
A fraternal twin.
Wiktionary