He is the legal heir to the legacy.

他是这个遗产的法定继承人。

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He was the legal heir to the throne.

他是王位的合法继承人。

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They adopted him as their legal heir.

他们立他为他们的法定继承人。

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As the legal heir to the League of Nations Mandate for Palestine, Israel is the legal sovereign of Judea and Samaria.

CENTERFORSECURITYPOLICY: Israel's path to victory

Ronald Protas, Graham's legal heir and the plaintiff in the case, battled the Martha Graham Dance Company and its dancers in court, arguing that he owned the copyrights to Graham's choreography.

NPR: Martha Graham Dancers Return to the Stage