 Complete the following phrase:  Brabham and Betty had three sons together: Geoff, Gary, and David. All three became involved in motorsport, with support from Brabham in their early years. Between them, they have won sportscar and single-seater races and championships. Geoff was an Indycar and sportscar racer who won five North American sportscar championships as well as the 24 Hours of Le Mans, while David competed in Formula One for the Brabham team and has also won the Le Mans race as well as three Japanese and North American sportscar titles. Gary also drove briefly in Formula One, although his F1 career consisted of two DNPQs for the Life team. Brabham and Betty divorced in 1994 after 43 years. Brabham married his second wife, Margaret in 1995 and they lived on the Gold Coast, Queensland. Brabhams grandson Matthew son of Geoff graduated from karts in 2010 and won two ladders of the Mazda Road to Indy, eventually racing in the 