Isobel Fea married John Sinclair of Dishes in Stronsay. They had an only son:

• Patrick Sinclair Fea who married Sarah Muir.  Patrick and Sarah had family:
• John Sinclair (b. 1811)
• Patrick Fea Sinclair (b. 1813)
• Janet Sinclair (b. 1815)
• Isabella Fea Sinclair (b. 19th January 1817)
• William Fotheringham Sinclair (b. 23rd November 1819)