The couple live in the Biscayne Bay mansion once owned by President John F. Kennedy and a 100-acre Oxford, England, estate, where tapestries and tarot-card tiles adorn the walls of their 12th century converted monastery and the Gibbs built a druid place of worship.
The estate was also where Robin Gibb's younger brother, pop star Andy Gibb, spent his last days before he was rushed to a hospital, where he died of a heart ailment. And it was where Robin Gibb carried on an affair with the housekeeper, until his wife learned about the pregnancy.
Yang and her daughter now live in a converted barn not far from the estate and, Meyer said, Robin Gibb provides financial support.
Unlike Arnold Schwarzenegger and Maria Shriver, who separated after news that he had fathered a son with their housekeeper became public, the Gibbs remain committed together -- in love. Since the birth of Snow Robin, they have also backed off from earlier statements they made about their infamous lifestyle.
In the 1990's, Robin famously told Howard Stern that he and his wife "like to cruise and we like to watch."
Amid talk about threesomes, he declared, "My wife is a lesbian and I love it."
But in a 2010 interview with the Daily Mail, the couple disavowed their previous statements.
"My earlier life was kind of wild, interesting and experimental, but you go past the experimental stage and start living," Dwina Gibb said.
"You get older and other things are more important," Robin Gibb said, adding that he had never actually seen his wife "indulge in a bisexual lifestyle."
"We actually have a very conservative relationship -- more so than the average couple. We don't drink or smoke. We're not partying all the time," said Robin Gibb, who has been sober and a vegan for decades. "Look, we're not stuffed shirts. We have a free relationship. We give each other time and space to pursue activities -- that doesn't mean other people."
So how did he explain his daughter, Snow Robin? He didn't.
"This isn't about her [Dwina's] relationship with her [Claire], or mine," he said. "It's about the relationship we have with each other, and all I can say about that is it's rock-solid and that's the most important thing to me. I've never felt anything different."