No, Prince Sverre Magnus, as well as Princess Martha is not part of the Royal House. The Royal House is only The King, The Queen, The Crown Prince, The Crown Princess and Princess Ingrid Alexandra; The Monarch and his heirs with consorts. Prince Sverre Magnus and Princess Martha with her family and the King's sisters and Marius is part of the Royal Family. This is also in part at least why Prince Sverre Magnus is only His Highness, though only in English, and not His Royal Highness. In Norwegian he is only titled as Prince.
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