Redtail is NOT Spottedleaf's brother, but Spottedleaf IS descended from Cloudstar.
EDIT TO COMMENT ABOVE:
Redtail is Spottedleaf's sister because Redtail's parents are Swiftbreeze and Adderfang and so are Spottedleaf's. Willowpelt is also Swiftbreeze and Adderfang's kit.
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