The translation su agrees in number with the noun which it modifies; their is translated by su, sus, depending on what follows: their father/mother su padre/madre; their books/magazines sus libros/revistas. For their used with parts of the body,
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The Spanish constitutional court (Tribunal Constitucional) is made up of twelve members. It decides all matters relating to constitutional legislation, including common law, international treaties, and regional statutes. There is no appeal against its decisions, and all other constitutional bodies are subject to its control.