Donna, Maughold register has:
Thomas son of John Sayle/ Margaret Garrett Parish Church 18 Aug 1811
William son of John Sayle/ Margaret Garret Parish Church 10 Jul 1814
Isabella Anne dau of John Sayle/ Margaret Garrett Parish Church 22 Dec 1816.

They appear to have married in Bride 1 March 1794, and had four earlier children bapt in Bride, and possibly one bapt in Andreas.

As Isabella had her mother's permission for her marriage I assume her father had died.

If in Maughold, a possibility is John SAYLE (P.E.Vullin) buried Maughold Nov 20 1827.

Sue