Question: The driver who came in third at the 1968 Canadian Grand Prix was a brother to whom?

Context paragraphs:
2005 Canadian Grand Prix: The 2005 Canadian Grand Prix was a Formula One motor race held on 12 June 2005 at the Circuit Gilles Villeneuve in Montreal, Quebec, Canada.  The 70-lap race was the eighth round of the 2005 Formula One season, the 43rd running of the Canadian Grand Prix, and the 37th running as a round of the World Championship.  It set a ratings record and was the most watched F1 race in history.  It was also the first of two consecutive North American rounds.  The race was won by McLaren driver Kimi Räikkönen, taking his third win from four races.  The two Ferrari cars completed the podium, with Michael Schumacher in second place and Rubens Barrichello in third.  Both Renaults failed to finish the race, but the team maintained their lead in the Constructors' Championship; their driver, Fernando Alonso also kept his lead in the Drivers' Championship, despite the gap between himself and nearest rival Räikkönen closing by ten points.

2000 Canadian Grand Prix: The 2000 Canadian Grand Prix (formally the XXXIIX Grand Prix Air Canada) was a Formula One motor race held on 18 June 2000 at the Circuit Gilles Villeneuve, Montreal, Quebec, Canada.  It was the eighth round of the 2000 Formula One season and the 38th Canadian Grand Prix.  The 69-lap race was won by Ferrari driver Michael Schumacher after starting from pole position.  His teammate Rubens Barrichello finished second with Giancarlo Fisichella third for the Benetton team.

1968 Canadian Grand Prix: The 1968 Canadian Grand Prix was a Formula One motor race held at the Circuit Mont-Tremblant in St. Jovite, Quebec, Canada on September 22, 1968.  It was race 10 of 12 in both the 1968 World Championship of Drivers and the 1968 International Cup for Formula One Manufacturers.  The 90-lap race was won by McLaren driver Denny Hulme after starting from sixth position.  Hulme's team-mate Bruce McLaren finished second and BRM driver Pedro Rodríguez came in third.

2011 Canadian Grand Prix: The 2011 Canadian Grand Prix (formally the Formula 1 Grand Prix du Canada) was a Formula One motor race held on 12 June 2011 at the Circuit Gilles Villeneuve, in Montreal, Quebec, Canada.  It was the seventh race of the 2011 Formula One season and the 48th Canadian Grand Prix.  The 70-lap race was won by McLaren driver Jenson Button after starting from seventh position.  Sebastian Vettel, who started from pole position, finished second in a Red Bull with teammate Mark Webber finishing third.

2015 Canadian Grand Prix: The 2015 Canadian Grand Prix, formally known as the Formula 1 Grand Prix du Canada 2015, was a Formula One motor race held on 7 June 2015 at the Circuit Gilles Villeneuve in Montreal, Quebec, Canada.  The race was the seventh round of the 2015 season, and marked the 52nd running of the Canadian Grand Prix.  Daniel Ricciardo was the defending race winner, having won his first ever grand prix the year before.

BRM P133: The BRM P133 was a Formula One racing car which raced in the 1968 and 1969 Formula One seasons.  It was powered by a 3.0-litre V12 engine.  Its best results were a second place at the 1968 Belgian Grand Prix, two third places at the 1968 Dutch Grand Prix and 1968 Canadian Grand Prix, as well as a fastest lap at the 1968 French Grand Prix all by Pedro Rodríguez.

2014 Canadian Grand Prix: The 2014 Canadian Grand Prix, formally known as the Formula 1 Grand Prix du Canada 2014, was a Formula One motor race that took place on 8 June 2014 at the Circuit Gilles Villeneuve in Montreal, Quebec, Canada.  Won by Daniel Ricciardo, the race was the seventh round of the 2014 season, and marked the 51st Canadian Grand Prix.  This is the sixth race in Grand Prix history to end behind the safety car, after a last lap collision between Felipe Massa and Sergio Pérez.

2010 Canadian Grand Prix: The 2010 Canadian Grand Prix (formally the XLVI Grand Prix du Canada) was the eighth round of the 2010 Formula One season.  It was held in Montreal, Quebec, Canada at the Circuit Gilles Villeneuve on 13 June 2010.  This was the first Grand Prix to be held on the North American continent since the 2008 Canadian Grand Prix.  The race was won by McLaren driver Lewis Hamilton, his second Canadian Grand Prix victory, ahead of teammate Jenson Button and Ferrari driver Fernando Alonso.  This race was Scuderia Ferrari's 800th start in a World Championship event as a team.

Canadian Grand Prix: The Canadian Grand Prix (French: "Grand Prix du Canada" ) is an annual auto race held in Canada since 1961.  It has been part of the Formula One World Championship since 1967.  It was first staged at Mosport Park in Bowmanville, Ontario as a sports car event, before alternating between Mosport and Circuit Mont-Tremblant, Quebec after Formula One took over the event.  After 1971, safety concerns led to the Grand Prix moving permanently to Mosport.  In 1978, after similar safety concerns with Mosport, the Canadian Grand Prix moved to its current home on Notre Dame Island in Montreal.

Pedro Rodríguez (racing driver): Pedro Rodríguez de la Vega (18 January 1940 – 11 July 1971) was a Mexican Grand Prix motor racing driver.  He was the older brother of Ricardo Rodríguez.

Supporting paragraphs: 1968 Canadian Grand Prix Pedro Rodríguez (racing driver)
Answer: Ricardo Rodríguez