Born in Te Awamutu in the Waikato region as the eldest in a family of five, Tamaki spent his childhood years on the family farm, called "Te Manuka", in the rural area of Te Kopua. His mother was "devoutly religious", taking her sons to the Te Awamutu Methodist Church on Sundays. Tamaki describes his father as an alcoholic who showed no interest in fatherhood. During Tamaki's childhood the family moved from the farm to Te Awamutu and then on to Tokoroa in 1970. While in Tokoroa, Tamaki became interested in rugby union and a little later came to enjoy pig-hunting and participating in a rock-band playing the pub circuit. Two of Tamaki's brothers, Doug and Mike, are tourism venture operators in Rotorua.