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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Bullfighting remains popular in many parts of Spain and some Latin American countries, and is regularly broadcast on television. During the bullfight (corrida) three bullfighters (matadores) fight a total of six bulls, two each.