TV host Chris Tarrant and his wife, Ingrid, have arrived in Cardiff at the end of a 160-mile charity bike ride.
The Tarrants said training for the tandem ride had led to cross words
The Tarrants, who joked their adventure nearly ended in divorce, and the 30 other riders hope to have raised £25,000 for the Rhys Daniels Trust.
Rhys and his sister, Charly, both died of an incurable degenerative disorder.
The charity riders arrived at the University Hospital of Wales to cheers on Monday after the three-day ride. The Tarrants are to auction their tandem.
"It was a challenge," admitted Ingrid Tarrant, who is 51. "Chris and I are still married - it almost ended in divorce".
The couple, who had bickered and rowed during training, said they would put the money from the tandem's auction towards the Rhys Daniels Trust.
"We will never cycle again together. That's it," said Mrs Tarrant.
Chris Tarrant said the tandem ride from St Paul's Cathedral has been "physically very tiring" but that the last leg through Cardiff has been "fantastic".
"I feel about 100 years old at the moment," admitted the The Who Wants To Be A Millionaire presenter, 58, but added a pint of beer would make him feel about 50 years younger.
Asked about auctioning the tandem, he replied:" I was thinking of throwing off the Severn Bridge. It's a great bike - for somebody else".
The cyclists carried keys to two homes created by the Rhys Daniels Trust for parents caring for sick children which are near the hospital in Cardiff
The Rhys Daniels Trust was set up by Barry and Carmen Daniels in memory of their children.
Rhys Daniels died despite having two bone marrow transplants
Rhys died of Batten's disease in December 1998. His sister Charly died of the same illness seven weeks later in February 1999.
The charity Home From Home Appeal established accommodation for parents of sick children, near the specialist hospitals where they are being treated.
The trust has already set up homes in Liverpool, Birmingham, Bristol and London.
"We've added a lot of support all the way," said Barry Daniels,after the latest ride, adding the "homes" would help provide normality, security and stability.