Papa Massata Diack has rejected allegations of extortion and bribery as the IAAF corruption scandal rumbles on.
Diack, a former marketing consultant for the IAAF and son of ex-president Lamine Diack, is said to have been "very active" in an alleged "system of corruption" that attempted to cover up suspected doping by blackmailing athletes.
He and three other men were charged by the IAAF's Ethics Commission with breaches of its Code of Ethics and were the subject of a disciplinary hearing last week.
In an interview with the BBC, Papa Massata Diack said: "There was no extortion of funds from any athlete.
"I've never met any athlete, any agent, any person in the world...asking to have a payment.
"I deal with corporate sponsors, I deal with governments, I deal with municipal government, I deal with Olympic committees, I never dealt with any athlete or any agent, so I reject those allegations."
Lamine Diack, who was succeeded as IAAF president by Sebastian Coe in August, is under investigation by French prosecutors, who suspect the 82-year-old of having received money to defer charges against Russian doping cheats.
The All-Russia Athletic Federation was suspended by the IAAF amid allegations of state-sponsored doping in a report from an independent commission set up by the World Anti-Doping Agency.
On his father, Papa Massata Diack added: "He's never been involved in any corrupt system to extort money from athletes, I totally reject that.
"Suddenly they are just going to destroy all he's built over the last 16 years and all the 39 years he's spent in the IAAF, so I find it very sad and I could not recognise certain acts or certain declarations made by certain people, but it's a fact of life.
"I think the best adage in this case, as we say in Senegal, is: 'God, we leave it to God to give the truth of all this.'"
Papa Massata Diack also emphatically denied accusations he sent a request via email for a payment of approximately $5million from Qatar in 2011 just before a decision was due on the their unsuccessful bid to host the 2017 World Championships.
"I have a very longstanding relationship with Qatar that dates to 1995, so I don't need to send an email when I need something from Qatar," he said.
"I have all the right people's contacts and I can go straight to them. So I reject it totally."