The three are accused of abducting the 14-year-old girl from a reserve in the Geelong suburb of St Albans Park and then raping her at a nearby address. A fourth brother was also charged, but they were later withdrawn.
The new charges against Kevin Wild are both sex offences, the court heard, but it was unclear what the new charges against his brothers are. The court did not release charge sheets.
Kevin Wild faces 16 charges, while Brodie and Allan Wild each face 11.
Police allege the Wild brothers had been at a family reunion in St Albans Park in the hours before the alleged offences and took the girl from a park, where she had been with a male friend.
The brothers are accused of taking the girl to the home of a relative of theirs and sexually assaulting her, despite the boy telling them her age.
It is alleged one of the brothers assaulted the boy. The court was closed for much of the first day of the committal hearing for the brothers, while the boy, 16, gave evidence.
Beforehand, Magistrate Belinda Wallington ordered everyone other than the accused men and their lawyers out of the court, and rejected a request by Allan Wild’s lawyer that the accused’s mother be allowed to stay in court for proceedings.