Thomas Mormaer, 9th Earl of Mar

Thomas married Countess Margaret Graham, of Menteith, daughter of John Graham, Earl of Menteith and Countess Mary Menteith, before 29 May 1354.⁷⁶⁹ The marriage ended in divorce about 1359. (Countess Margaret Graham, of Menteith was born before 1334,⁷⁶⁹ died before 4 May 1380 ^769,791 and was buried in Inchmahome Priory, Perthshire, Scotland ⁷⁶⁹.)

Thomas next married Margaret Stewart, daughter of Thomas Stewart, of Angus and Margaret St. Clair, before 1374.⁷⁶⁹ (Margaret Stewart was born about 1354 ⁶³¹ and died on 23 Mar 1418 ⁶³¹.)