Ernest White, formerly of St Margarets Castletown

I am hoping to contact Ernest White or his sister Isobel Margaret White. They lived with their mum, aunt Margaret (school teacher in Castletown) and grannie - Jessie Swanson in the big house "St Margarets" in Castletown.
Jessie Swanson was a cousin of my great auntie Jessie Levack (Nee Wallace) of Brough and I used to meet them in the 1950s when I came up from Edinburgh on summer holidays.
I saw a post on Caithness schools showing Margaret Swanson and a post by Ernie White identifying her, dated 11 December 2006.
So I'm wondering if he, or his sister are still on this site?
any information gratefully received :grin:
David Petrie