Ian Campbell

Ian Campbell was the eldest adopted son of David Campbell and his Gallifreyan wife, Susan Campbell.

Biography
Orphaned in the Dalek Invasion of Earth in the 22nd century, he was adopted by David and Susan after the human victory. He was named after Ian Chesterton, an early companion of Susan's grandfather, the First Doctor.

He also had two adopted siblings, Barbara Campbell and David Campbell Junior. (EDA: Legacy of the Daleks) Some time after Ian, Barbara and David Junior were adopted, David and Susan concieved a child whom they named Alex Campbell. Alex was, on some level, Ian's youngest brother. (BFA: An Earthly Child)