Bee Gee's singer in coma - Robin Gibb

Critical: Robin Gibb's son RJ says the family are praying for his father, who has slipped into a coma

Robin Gibb's son has said he'll do 'anything' for his father to recover.

The iconic Bee Gees singer slipped into a coma on Friday and doctors fear he has days to live.

Robin-John, known as RJ for short, said: 'My dad has had a hard recovery from cancer.

'When you get rid of the cancer a lot of periphery problems can occur. This is so sad.'

He told The People that everyone the family were 'praying' for a recovery and that he felt honoured to be living in his father's shadow.

RJ added: 'If people say that I’m living in my ­father’s shadow, all I can say is what a great shadow that is to be living in.'

The 62-year-old star made a recovery from liver and colon cancer this year, but doctors believe a second tumor may be present.

He has also developed pneumonia.

His wife Dwina, brother Barry, 65, daughter Melissa, 37, and sons Spencer, 39, and RJ, 29, have been keeping vigil at his

Bedside at a private hospital in Chelsea, West London.

A family friend told the The Sun: 'Our prayers are with Robin. He has kept so positive and always believed he could beat this.

Sadly, it looks like he has developed pneumonia, which is very bad in his situation.

'If there is anyone you would put money on pulling through such a dire situation, it would be Robin because he is a fighter.

But this is a battle he will struggle to win.'

Robin revealed his battle with cancer in October 2010.

Height of fame: Robin, right and his late twin brother Maurice, left, and older brother Barry performing in 1979

He had emergency surgery to treat a blocked bowel, before a further operation to treat a twisted bowel. Colon cancer was then discovered and it spread to his liver.

His twin brother Maurice died of complications resulting from a twisted intestine in 2003, aged 53.

Robin famously appeared on the Alan Titchmarsh Show looking pale and gaunt and has cancelled a handful of appearance over the past two years because of his health.

Barry Gibb earlier this week jetted into the UK from Tennessee to join other members of the family.

His brother's arrival this week comes after his nephew - Robin's son RJ - described the overwhelming moment the family

Learned that the Bee Gees star was in remission from cancer.

Robin-John revealed that he was sitting next to his famous father in his hospital bed when the doctor told them the happy news.

'I leant over the bed and I kissed him on the forehead and just said, "I love you",' RJ told the Mirror.

Now and then: The singer looked much thinner last year (L) compared to his appearance in 2007

'Then we sat together for ages, just taking it all in and being together without saying anything.
'It was the best news we could have hoped for. It was the most beautiful feeling and instantly life was so much better.'

However, this isn't the first time that Robin's family and fans have been left worried as the singer also re-entered hospital

Back In February.

Robin was admitted into a London clinic as part of his treatment and rehabilitation.

At the time a family source told The Sun: 'We feared the worst. But doctors have said they are astounded at his response to

Treatment.' but it was only a matter of week's before this that Robin insisted he had made a 'spectacular' recovery.

True love: Robin and his wife Dwina at their Oxfordshire home in 2010

Speaking to BBC Radio 2 host Steve Wright, he revealed that he felt better than he had done for a decade.

'The prognosis is that it's almost gone and I feel fantastic and really from now on it's just what they could describe as a "mopping-up" operation,' he said. 'I am very active and my sense of well-being is good.'

Gibb also suggested that reports about his health had been conjecture, adding: 'I mean the fact is, I've never spoken to anybody about my condition or the condition that I was in and a lot of them go over the top to the point where they're telling me things that I didn't even know about myself.'

And despite being admitted to hospital last week for further intestinal surgery, the singer had been given the all clear.

Similar illness: Maurice sadly died of complications resulting from a twisted intestine in 2003 aged 53

A statement released on the singer's behalf said: 'On Sunday 25 March, Robin Gibb underwent further intestinal surgery.

'He is currently recovering in hospital and therefore, for the time being, all existing commitments prior to the Titanic Requiem concert, have had to be cancelled.'

Robin and RJ had composed the music for the Royal Philharmonic performance at Westminster Central Hall next week.

In February he had talked about feeling 'fantastic' following his treatment and said he had begun to put on weight after looking increasingly gaunt.

Brotherly love: Robin's sibling Barry arrived in the UK this week to be by his brother's side

At first his illness was thought to have been due to the hereditary intestinal condition which led to the death of his twin brother.

Speaking about his cancer, last month he said: 'The prognosis is that it's almost gone and I feel fantastic and really from now on it's just what they could describe as a "mopping-up" operation.'

In an interview earlier this month, Gibb pondered whether his illness is 'karma' for the fame and fortune.he has enjoyed.

‘I sometimes wonder if all the tragedies my family has suffered, like Andy and Maurice dying so young and everything that’s happened to me recently, is a kind of karmic price we are paying for all the fame and fortune we’ve had.

‘But we’ve worked hard for everything we’ve achieved.’

A picture of health: Robin performing at The London Palladium in February

Thoughts and prayers going out to him and his family...Love the BeeGee's