Question: What is the relationship between Antonio Rudiger and a German professional footballer who plays as a defender for Chelsea and the German national team?

Context paragraphs:
Sahr Senesie: Sahr Senesie (born June 20, 1985 in Koindu, Sierra Leone) is a retired German footballer of Sierra Leonean descent.  He is the half-brother of Chelsea player Antonio Rüdiger.

Thomas Müller: Thomas Müller (] ; born 13 September 1989) is a German professional footballer who plays for and vice-captains Bayern Munich and the German national team.  A versatile player, Müller plays as a midfielder or forward, and has been deployed in a variety of attacking roles – as an attacking midfielder, second striker, centre forward and on either wing.  He has been praised for his positioning, teamwork and stamina, work-rate, and has shown consistency in both scoring and creating goals.

Mats Hummels: Mats Julian Hummels (] ; born 16 December 1988) is a German professional footballer who plays as a central defender for Bayern Munich and the Germany national team.

Jérôme Boateng: Jérôme Agyenim Boateng (] ; born 3 September 1988) is a German professional footballer who plays as a defender for German club Bayern Munich and the Germany national team.  A versatile defender, Boateng primarily is a centre-back, although he can also play as a right-back.  Physically strong and composed in possession, he has garnered a reputation as a tough-tackling defender, with good passing and an ability to read the game, and is considered to be one of the world's best at his position.

Tibor Pleiß: Tibor Pleiß ( , alternative spelling Pleiss; born 2 November 1989) is a German professional basketball player for Valencia Basket of the Liga ACB and the EuroLeague.  Standing 7 ft , he plays the center position.  He is also a member of the German national team.

Jörg Albertz: Jörg Albertz (born 29 January 1971 in Mönchengladbach) is a retired German professional footballer.  Between 1996 and 1998 he played three international games for the German national football team.

Per Mertesacker: Per Mertesacker (] ; born 29 September 1984) is a German professional footballer who plays as a centre back for Premier League club Arsenal.  He also played for the Germany national team but retired in August 2014 after winning the World Cup.  Mertesacker is a youth product of Hannover 96 and he made his senior league debut in November 2003.  He was soon dubbed "the Defence Pole" (""die Abwehrlatte"") by German tabloids and gained a reputation for his good disciplinary record, going 31 Bundesliga games without being booked.  Since joining Arsenal, their fans have nicknamed him "the BFG", which is short for "Big Fucking German" and an allusion to Roald Dahl's "The BFG" due to his height.  He has been described as an imposing, reliable, dominant and an accomplished defender.

Antonio Rüdiger: Antonio Rüdiger (born 3 March 1993) is a German professional footballer who plays as a defender for Chelsea and the Germany national team.

Shkodran Mustafi: Shkodran Mustafi (] ; born 17 April 1992) is a German professional footballer who plays as a central defender for English club Arsenal and the Germany national team.

Thomas Schneider (footballer): Thomas Schneider (born 24 November 1972) is a German professional football manager and former defender, who is currently assistant manager to Joachim Löw for the German national team.  Schneider had previously been manager of German Bundesliga club VfB Stuttgart.

Supporting paragraphs: Sahr Senesie Antonio Rüdiger
Answer: He is the half-brother