India, Jan. 19 -- Warren Buffett is one of the world's most recognisable business figures. But for years, his youngest son, Peter Buffett, was largely unaware of just how rich and influential his father was.

According to a report by Fortune, Peter Buffett once said he only realised his father's status in his 20s, after seeing his name featured on Forbes' list of the richest Americans.

"I'm not kidding. It was when I was in my 20s that my mom and I talked at some point, because there he was, on this list," Peter said in a 2013 interview with Forbes. "And we laughed about it, because we said, 'Well, isn't it funny? You know, we know who we are, but everybody's treating us differently now.'"

Peter, now 67, is the youngest of Buffett's 3 c...