At the very start of giving evidence at Belfast Crown Court on his own behalf, 58-year-old Liam Adams was asked directly if he ever raped, abused or forced his daughter Aine to perform sex acts.
To each and every question Adams told Deputy Recorder Judge Corinne Philpott QC: "No your honour."
Liam Adams, from Bearnagh Drive, is charged with 10 offences including rape, indecent assault and gross indecency against his daughter more than 30 years ago on dates between March 1977 and March 1983.
He denies all charges.
His daughter 40-year-old Aine Adams has waived her right to anonymity.
She has testified that between the ages of four and nine, her father raped and abused her at various addresses the family lived in including when her mother was in hospital giving birth to her brother and also while she was in bed beside her brother.
The jury have heard that although the allegations were brought to police attention in 1987, six months after a family confrontation in Buncrana, the complaint was withdrawn.
Adams' ex-wife Sarah Campbell said that was because she felt the police were more interested in her husband's other activities.
The allegations were raised again in 2007 and it was then that Liam Adams was arrested and interviewed.
The jury has also heard that when initially asked about being confronted by his brother Gerry Adams, his wife and daughter, Liam Adams denied it happened.
On Thursday, however, he conceded there was such a confrontation when his brother told him of Aine's claims.
He told the court he denied the confrontation to police because it had been "drummed into us that we don't talk about Gerry Adams".
He said: "It had been drummed into us since I was a young person, since the Troubles started that you don't talk about Gerry Adams - you don't talk about him in the barracks, to the British army, in the media or even as you get older and socialise, you don't talk about Gerry Adams."
He further claimed that within weeks of those denials, he revealed to solicitor Philip Breen that the meeting in Buncrana had taken place.
Adams told his lawyer that Mr Breen had an "angry" tone in his voice when he refused the advice to go and tell the police, adding in "hindsight, I should have gone" to police.
Asked again by defence QC Eilis McDermott if he ever raped or abused his daughter, Adams declared "certainly not...nothing like that ever happened".
He further claimed the allegations were "absolute rubbish".
The jury heard him describe how he and his ex-wife married when they were 17 and 16 respectively and went on to have four children with Aine being the eldest.
The couple later split in 1981.
Adams recounted how for around 20 years he had worked as a community youth worker, engaging with teenagers at youth clubs doing drug awareness and computer courses as well as taking cross-community groups of young people on residential weekends.
Asked by Ms McDermott if there was ever any complaint made about his behaviour either to him or the police, Adams said there had not been a single one.
Under cross-examination from prosecution QC Ciaran Murphy, Adams described how "devastated would not be the word" when he heard of his daughter's claims.
Agreeing with the lawyer's suggestion that he had a "normal father-daughter relationship" when Aine was growing up, he refuted the further suggestion that she was telling the truth.
"No I have told the truth," claimed Adams.
He repeatedly told the lawyer that his denials of the Buncrana meeting were because of Gerry Adams' involvement in it, claiming that he did not know he could say "no comment" to interviewing police.
Mr Murphy put to him that he had repeatedly lied about the meeting and the abuse he had put Aine through but again, Adams refuted the suggestion and said the allegations were "absolute rubbish".
The trial continues.