Jason Anthony Michel, 56, and Kiley Alexander Michel, 54, had denied two offences each.
After some 90 minutes of deliberation, the court found both men guilty, with unanimous decisions to the first counts they faced and by 6-1 majorities to the second. The trial had lasted eight days and both defendants had been on bail throughout the proceedings. They committed the offences in the three-year period from February 2000, when the complainant was under the age of 16.
Judge Catherine Fooks took more than two hours to sum up the case before sending the jurats out to reach their verdicts. She said there were irreconcilable differences between the accounts that had been given, and that was a matter for the jurats to determine.
The complainant was the only witness for the prosecution while a total of five people gave evidence for the defence.
Jason Michel also gave evidence in court, while his brother relied on a statement he had made out of court, as per his right.
Neither man was able to say why the woman might have made the allegations against them which they had claimed to be false. Counsel for the defence questioned why it had taken the woman until 2023 to make a complaint to police.
She said that she had felt before then that there was nobody she could tell about it. The court heard that Jason Michel had no previous convictions and his brother could be treated as someone who was of previously good character.
Both were made subject to notification requirements on conviction, and probation reports were ordered in respect of each.
A date for sentencing is expected to be set tomorrow.
Both men were readmitted to bail in the interim with conditions that they do not leave or attempt to leave the island and do not contact the complainant.