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Daughter of Sir Thomas Somerville, 1st Lord Somerville and Janet Stewart of Darnley Wife of Sir William Hay of Yester, Kt. Sister of Giles Somerville; Thomas Somverville of Racklay and Sir William Somerville, 2nd Lord Somerville Half sister of Lady Margaret Somerville; Janet Scott and Elizabeth Somerville
The Scots Peerage VIII: 9
https://en.m.wikipedia.org/wiki/Mary_Somerville