“I have another brother I love and adore that I didn’t know about,” the 62-year-old singer said in an interview with Desert Island Discs.
He revealed that he found out about his half-brother in 2000, adding that he was “at peace” with it.
Bono’s mother Iris, who died of a brain aneurysm in 1974 when the singer was 14, also did not know that her husband had a child with another woman.
“It’s a very close family,” Bono said. “And I realized that my father had a deep friendship with this wonderful woman who is part of the family, and then they had a child. And it was all kept secret.”
When Bono learned the secret, he spoke to his father Bob shortly before his death in 2001.
“I asked him if he loved my mother, and he answered yes,” the musician recalls. “I asked how it could have happened, and he said – it happened – and that he was trying to do it for good and to do it right.
“He didn’t apologize, he just said. That’s the facts. And I’m at peace with it.”
Asked if his mother knew about it, Bono replied that no one knew.
“My father obviously survived a lot, but partly his mind was elsewhere because his heart was elsewhere.” He described his relationship with his father as “complicated.”
Bono, who plans to publish his autobiography this year, gained fame in the early 1980s, becoming one of the most famous rock stars in the world. His band “U2” is known for such hits as “Beautiful Day”, “One”, “With Or Without You” and “I Still Haven’t Found What I’m Looking For”.