He is one of six men who allege the veteran broadcaster kissed, groped, or subjected them to sexual misconduct between 2003 and 2020 across Sydney and the NSW Southern Highlands.
Jones, the 85-year-old former king of Sydney's airwaves, has pleaded not guilty to 22 charges of indecent assault and sexual touching without consent against the men, who cannot be identified for legal reasons.
A former athlete was the first complainant to testify in Jones's marathon Local Court fight, claiming he had been subjected to unwanted kisses and non-consensual sexual contact while in his late teens.
His brother followed him in the witness box on Tuesday, telling the court he only learned of the allegations when the brothers met up after Jones was arrested.
"This is the hardest thing I've ever had to tell you," the athlete allegedly told his brother.
"You've probably seen the news about (Jones).
"I'm one of the people who has come forward."
The brother inquired why the athlete had not told him earlier and was told the alleged victim did not want to lose the money and support Jones gave him, the court was told.
"(He said) he didn't know what to do," the brother recalled.
Jones bought the athlete a mobile phone, a car, and paid him a weekly stipend of up to $600 for nine years so he could focus on sport.
When the brother asked how bad the alleged assaults were, he said the athlete replied in explicit terms.
"He said: 'Nothing too bad, he didn't try to f*** me or anything like that ... he would grab me on the cock or kiss me'," the brother told the court.
But he said he never saw Jones act inappropriately towards the athlete, who had in turn never told him he was frightened of the former Wallabies coach.
Jones offered to help the athlete's brother pay for an engagement ring, the court was told.
The athlete earlier told the court he refrained from disclosing the alleged assaults to his mother before he went to the police in 2024.
He explained he did not want to raise it with her because he thought she would push him to come forward.
"I thought exactly what's happened here (would happen)," he told the court.
"I would be called a liar and I would be crushed in court and no one would believe me."
When the allegations were aired in newspapers in 2023, his mother had asked him whether the shock jock had been inappropriate with him.
"I lied to her," the athlete said.
Jones's barrister Gabrielle Bashir SC suggested his initial answer to his mother had been the correct version of events.
During three gruelling days of cross examination, the athlete accepted there were inconsistencies in his statements but insisted he was doing his best to recall events from two decades ago.
The athlete repeatedly denied lying about the allegations to humiliate Jones or for his own financial gain after falling on hard times.
The longtime shock jock - dressed in a grey jacket and navy slacks - was seen chatting to one of his lawyers after the athlete completed his six-day stint in the witness box on Tuesday.
He is accused of indecently assaulting and sexually touching the six complainants at a time when he had a stranglehold on Sydney's airwaves, winning the breakfast slot a record 226 times.
During his 35 years on radio, Jones became a feared interviewer capable of grilling leaders while sharing his outspoken, conservative views across the country.
1800 RESPECT (1800 737 732)
National Sexual Abuse and Redress Support Service 1800 211 028
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