Carl Pistorius, Oscar's older brother stands accused of culpable homicide over the death of a female motorcyclist in a traffic accident.
The charges date back to an incident in 2010, but have only just emerged.
He is due to face trial in March, three months before his younger brother Oscar goes to court over the alleged murder of his model girlfriend Reeva Steenkamp.
Carl was ever-present at his brother's bail hearing last week, with magistrate Desmond Nair ultimately choosing to award the Paralympic and Olympic athlete bail.
Lawyer Kenny Oldwage said in a statement from the family: "There is no doubt that Carl is innocent and the charge will be challenged in court.
"Blood tests conducted by the police at the time proved that he had not been under the influence of alcohol, confirming that it was a tragic road accident after the deceased collided with Carl's car,"
- Eurosport
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