Barry Gibb and Robin Gibb Barry Gibb and Robin Gibb

The Bee Gees' Robin Gibb is reportedly battling liver cancer, according to multiple British outlets.

Gibb, 61, has been undergoing treatment for several months and was rushed to the hospital last week after an emergency call was placed from his home, The Daily Mail reports. He returned home five hours later and was joined by his mother, Barbara, 91, and brother Barry, 65, who flew in from the U.S.

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Gibb posted a picture of him and his brother

on his website on Nov. 15 under the title "Barry good times," in which he looks frail and gaunt. He makes no mention of his health."It was great to see Barry and Linda on their surprise visit!" Gibb wrote. "We got a lot of talking done and made good plans between us for the future. ... We all had a great time but most of all it was the best tonic ever to be with Barry again and making plans!"

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Last month, Gibb announced on his site that he was undergoing tests for abdominal pain and was being treated for inflammation of the colon. His twin brother, Maurice, died in 2003 of intestine complications, after which the Bee Gees, who have sold more than 200 million records, broke up.