He married Agnes Crichton, daughter of William Crichton, 1st Lord Crichton, Chancellor of Scotland, but had no surviving children.
Another descendant of Thomas de Crichton was Sir William Crichton who in 1439 was appointed to the office of Chancellor of Scotland, during the minority of James II of Scotland.
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The lordships of Annandale and Bothwell were annexed by the crown, Galloway to Margaret Douglas, and the Douglas lands and earldom passed to William's great-uncle James Douglas, Earl of Avondale, who was himself implicated, with Sir William Crichton, in the murder of the young earl.
To the west of the village is the 15th-century parish church, formerly a collegiate church, established by William Crichton, 1st Lord Crichton, who served as Lord Chancellor of Scotland from 1439 to 1453.