Gerry Adams never confronted his brother Liam about child sex abuse allegations involving his daughter, a court has heard.
During interviews given under caution to the PSNI in February 2007, Liam Adams rejected claims that the Sinn Fein president had quizzed him about the alleged abuse of his daughter during a meeting in Co Donegal 20 years earlier.
"This definitely did not happen," Liam Adams said in a police statement which was read to the court.
The 57-year-old from Bearnagh Drive in west Belfast also emphatically denied to police that he had confessed to the alleged abuse during a walk in Dundalk with his older sibling in 2000.
During cross examination of PSNI Detective Inspector Eamon Corrigan, who was the lead interviewing officer in 2007, the defence lawyer said a confession was of critical importance and would have been seen as a major breakthrough in the investigation.
"This was a potentially explosive piece of evidence coming from a man of international standing," Joe Brolly told the court.
Mr Corrigan replied: "If a person had that knowledge it would be important regardless of the person's standing."
Liam Adams is accused of 10 counts of child sex abuse including rape, indecent assault and gross indecency against his daughter Aine, now aged 40, who has waived her right to anonymity.
He has denied all the charges against him.
On Monday, Belfast Crown Court heard how Gerry Adams had not told police about the alleged confession until October 2009 despite making a statement to the PSNI more than two years before.