• Margaret Fea (chr. 3 July 1752, Lerwick, Shetland)
  
• William FEA (chr. 4 Dec 1754, Lerwick, Shetland)

(2)  Jean INNES, married 21 Nov 1757 at Lerwick, Magnus and Jean had a son and a daughter

• George Fea  (chr. 16 Feb 1759, Lerwick, Shetland)

• Barbara FEA (chr. 25 Jun 1760, Lerwick, Shetland)

(3)  Margaret HAY, on 1/2 Feb 1767 at Lerwick.  Margaret was the daughter and heiress of Thomas HAY of Clivocast (Brucehall, Unst).   Magnus and Margaret appear to have had the following children:

• Thomas FEA (chr. 14 Dec 1767 Lerwick, Shetland)
• James Fea  (chr.  22 Nov 1768  Lerwick, Shetland)
• Magnus Fea  (chr. 5 April 1771  Lerwick, Shetland)                                              
  

• William FEA (chr. 27 Aug 1772  Lerwick, Shetland)
• Laurence Fea (chr.  26 Sept 1773  Lerwick, Shetland)
• Martha Fea  (chr. 6 Dec 1774  Lerwick, Shetland)
• Elizabeth Fea  (chr. 9n Apr 1782  Lerwick, Shetland)