In his journals, Sir John Lauder, Lord Fountainhall relates how he went with his father to Iddingtoun in Berwickshire in September 1670, and mentions that the superior of the nearby town of Chirnside was "My Lord Mordington" who was also patron of the Kirk there.
He also said that he "saw Paxtoun and Edringtone, a part of [Lauder of] Basses lands, and given away to a brother, now belongs to my Lord Mordington.
My Lord Mordington (also) had all of Magdalene field (by the River Tweed), but he could not get it peaceably possessed for thesse of Berwick, so he sold it to Watsone."
An Inventory of the Writs in the National Archives (GD206/6/153) produced for Walter Harper in process of reduction and improbation pursued by Robert Rochead of Masterton are against the creditors of [Lord] Mordington with the Writs (legal papers), dated 1706.
James Douglas, 3rd Lord Mordington, married Anne (b.1651) daughter of Alexander Seton, 1st Viscount of Kingston by his first wife, Jean (d. August 1651), daughter of Sir George Fletcher, of the Innerpeffer family.