The children of the late First Minister Donald Dewar said the formal opening of the new parliament by the Queen was to be a "bitter sweet" occasion.
Iain and Marion Dewar show the Queen and Presiding Officer George Reid around the library
Iain Dewar said the day would remind him and sister Marion that their father was no longer with them.
But he was comforted by the fact that Mr Dewar would have loved the event.
A permanent memorial to Scotland's founding father of devolution, who died in 2000, will be opened in the form of a library inside the parliament.
Mr Dewar was enthusiastic about plans for a brand new home for the Scottish Parliament.
He died after the architect, Enric Miralles, was chosen but before the building was completed.
His son said before the ceremony on Saturday: "It will be a bitter sweet day, I always feel sad when I come to Scotland because it reminds me of dad.
"But it will be a day of celebration and he would have loved it so much so, and that will be foremost in my mind."
Iain said he was able to witness the delight of his father at the Royal opening of Scotland's devolved parliament in 1999.
"I have never seen him happier," he said.
Mr Dewar's daughter said her father would have viewed a library in his name with "wry amusement".
Marion added: "But the idea of a reading room in the Scottish Parliament would have appealed to him, he would have been pleased with it.
'Passion for books'
"When dad died there was such a widespread sadness and expression from people across Scotland.
"Thousands of letters and books of condolence were sent. We did not respond to them all but we appreciated getting them.
"We just felt that that scale of response demanded something in return and that is why creating a permanent memorial for dad was born.
"Given his passion for devolution in Scotland and his passion for books a scheme which married the two was appropriate."
Both Mr Dewar's son and daughter agreed that the one thing their father would have loved about the celebrations on Saturday was eating the buffet.
Marion said: "With any function that dad went to it was the buffet lunch which was the highlight for him."