When he and his brother were seven, their parents, Simone and Jörg Kaulitz, separated. Soon after Simone started dating Gordon Trümper, the guitarist of the german rock band Fatun and they married after twelve years of dating, in 2009. Since an early age that Tom showed interest in playing the guitar, as did Bill in singing, and in several interviews, Bill claims that he and Tom started writing songs since the age of seven. When Gordon Trümper noticed their musical inclinations, he helped the both to start their own band.