He had been in hospital for the last month receiving treatment for pneumonia when it transpired that he was also suffering from cancer.
Another person added: "Brendan Grace RIP, a lovely person, unrivalled comedian, superb singer and guitarist, our careers intertwined over the years, our sincerest condolences to Eileen and family, RIP Brendan".
Brendan owned the Brendan Grace Pub which was located on Main Street for several years, before closing for business in 2011.
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Grace speaks about his upbringing, his start on the comedy circuit, and some of his most-loved characters, including Fr Fintan Stack in Father Ted.
As a musician, Grace's impressive string of hits included, most notably, the chart-topping Irish song Combine Harvester, which was later covered by The Wurzels.
He has had a number of health issues in recent years and suffered a stroke and complications from diabetes.
A comedian and storyteller of the highest order, Mrs Brown's Boys creator Brendan O'Carroll has led the tributes to a man who was much-loved and will be much-missed. His agent, Tom Kelly, told RTÉ Radio One's Morning Ireland: "Brendan Grace was one of the greatest entertainers of this era, no doubt about that. Rest peacefully Bottler you've earned it".