Question: Who was the first singing brothers in the hall of fame?
Disambiguated questions and answers: question: Who was the first singing brothers in the rock and roll hall of fame?
Who was the first singing brothers in the country music hall of fame?
answer: The Everly Brothers
Don Everly Phil Everly
The Louvin Brothers, the Everly Brothers, and the Delmore Brothers
The Louvin Brothers
the Everly Brothers
the Delmore Brothers
Natural Questions answer: The Everly Brothers (from the Wikipedia article "List of Rock and Roll Hall of Fame inductees")