Zetta Sinclair, Isla's mother, was a talented songwriter and poet, and became a founding member of the Aberdeen Folk Club.
She was a regular guest on many other television and radio shows including Hoot'nanny, My Kind of Folk, Corriefolk, On Tour and Heather Mixture.
St Clair sang at the opening night of the Buckie and District Folk-Song Club, run by her mother Zetta, in 1967.
St Clair was offered programmes as diverse as To Scotland With Love for light entertainment and Let's See for BBC educational television.
[3] St Clair's rise to national prominence was in 1978 when she became co-host with Larry Grayson in BBC Television's The Generation Game.
The series was a success and won The Roses Award "Best Television Programme" and in Munich, the coveted "Prix Jeunesse for Best Light Entertainment".
Despite her success as a presenter St Clair wanted more singing roles, and in 1984 she was offered the part of Maria in The Sound of Music at Worthing, with Edmund Hockridge.
In 1995, she devised a series called Tatties and Herrin, commissioned by BBC Radio, which told the story of the fishing and farming communities of Scotland's north east.
In 2002, St Clair was awarded an honorary degree as Master of the University of Aberdeen for her lifelong contribution to the traditional music of Scotland.
During the year she released two more albums: the critically acclaimed The Lady and The Piper with Gordon Walker; and My Generation a collection of children's songs.
St Clair was invited to sing the lament "Flowers of the Forest" at Tyne Cot Cemetery in Belgium, in 2007, to commemorate the 90th anniversary of the Battle of Passchendaele, in the First World War.