The son of the Lockerbie bomber has told the BBC that his family believe he is innocent of the atrocity and that one day everyone will know the truth.
The BBC was invited to the home of Abdelbaset al-Megrahi in the Libyan capital Tripoli.
His son Khaled al-Megrahi said he wanted to show the people of Scotland how sick his father was.
Megrahi was released from a Scottish prison two years ago because he has terminal prostate cancer.
The bomber returned to Libya after being freed from Greenock Prison on compassionate grounds, with doctors judging he had three months to live.
Megrahi was the only person convicted of killing 270 people in 1988 in the bombing of Pan Am flight 103 over the south of Scotland town of Lockerbie.
The victims of the bombing were mainly US nationals and the decision to release him, taken by Scottish Justice Secretary Kenny MacAskill, sparked an angry reaction in the United States.
Since the fall of Colonel Gaddafi's regime in Libya, there have been calls for Megrahi to be returned to jail in the UK or tried in the US.
Megrahi's son told the BBC's Middle East Editor Jeremy Bowen: "He is so sick. If you see him now and compare with before you will see his body has become very ill and very weak."
He said Megrahi had stopped eating and was in a deep sleep most of the time.
Khaled al-Megrahi said: "I want everybody, especially in the UK and specific in Scotland to see my dad.
"On the news some people say he is not sick and he is not at home and some people say he has run away.
"I want you to see my dad, he cannot move from his room."
His son also insisted that Megrahi was not guilty of the Lockerbie atrocity.
He said: "He believes and we know that everybody will see the truth. I know my father is innocent and one day his innocence will come out."
Asked about the people who died in the bombing, he said: "We feel sorry about all the people who died. We want to know who did this bad thing. We want to know the truth as well."
A Scottish Government spokesman said: "Mr Al-Megrahi is an extremely sick man, dying of terminal prostate cancer, and matters regarding his medical condition should really be left there.
"It is in no one's interest for there to be a running commentary on Mr Al-Megrahi's medical condition, and we have no intention of providing one.
"As is abundantly clear, Scotland's justice secretary granted compassionate release to Mr Al-Megrahi according to the due process of Scots law, and without regard to any other factor."