Notes:

According to "The Sinclairs of Borlum, Toftkemp, and Thura" in a chaptercalled "The Irish Scions " Chapter XIV, which came from a volume called" The Saint Clairs of the Isles". and two other sources #1 CaithnessFamily History, by John Henderson, & # 2 from the Sinclair News letterCalled GIRNIGOE, News letter of the Clan Sinclair, vol 9 April 1998.Information from Ian Sinclair of Toronto

William + Margaret (of Thurster) Doull. Margaret (daughter of John (of Thurster) Doull) and died. [Group Sheet] [Family Chart]

Notes:

According to "The Sinclairs of Borlum, Toftkemp, and Thura" in a chaptercalled "The Irish Scions " Chapter XIV, which came from a volume called" The Saint Clairs of the Isles". and two other sources #1 CaithnessFamily History, by John Henderson, & # 2 from the Sinclair News letterCalled GIRNIGOE, News letter of the Clan Sinclair, vol 9 April 1998.Information from Ian Sinclair of Toronto

"Possibly grandson of William Sinclair of Dunbeath to whom Brubster,Brims, Toftkemp and Thura belonged." "If of Dunreath family, he wasprobably the son of George Sinclair of Downreay."

also it says
"he may have been of the family of Murkle, and if so, or he may havebeen a brother of John Sinclair, first of Assery, and a son of JamesSinclair, first of Murkle."