"The two of us are getting back together again as we speak," Gibb told the BBC.
He said he and Barry had "got through the breakwater of emotions" following their sibling's 2003 death.
Maurice Gibb died suddenly in 2003, aged 53, from complications following an operation to correct a twisted intestine. At the time his brothers said they would no longer perform as the Bee Gees after 45 years together.
A fourth brother, Andy, who was also a singer but not part of the group, died in 1988 at the age of 30 from heart attack.
The Bee Gees were one of the biggest acts of the 1970s, winning nine Grammy awards as well as a list of other awards. The band's hits included "Stayin' Aline," "Night Fever," "How Deep is Your Love" and "Jive Talkin.'"
Get more: Reuters