John & Richard (The ones in Robinhood)
Alexander & Selene (Cleopatra's twin children)
Mary & Elizabeth (Queens of England, Half Siblings.)
Might well as include the entire brood of Henry II - quite possibly one of the most fractitious groups of children ever sired in history..drove poor Henry II to a early grave with their treachery and intrigue against poor old Dad. Particularly his ungrateful sons ! XD And let's not forget what Richard I did to Cyprus in retaliation of the Cyprian's treatment of his sister.
Geoffrey Archbishop of York
Henry the Young King
Matilda, Duchess of Saxony
Richard I
Geoffrey II Duke of Brittany
Eleanor Queen of Castile
Joan Queen of Sicily
John Lackland
William Earl of Salisbury
Plus Eleanor's offspring who'd be half-sisters to the above:
Marie Countess of Champagne
Alix Countess of Blois
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