I have, though, found two Sholto Douglases nearby - one dying in Cockpen in 1774, no other information given (so not the child of Robert and Mary, as parent names are given on that page when it's a child), and I'm wondering if he could be related to Robert. There seem to be a good number of 'non-gentry' Douglases in the area, but I've been quite unsuccessful with finding a likely birth for Robert, or indeed for Mary Carse. The other Sholto is one who is married in Canongate in 1795, to Helen Aitken daughter of an Alexander Aitken, labourer in Dalkeith, and they have a few children (including another Sholto). This Sholto is a gentleman's servant, which is interesting, but I've no evidence of him being connected though going only by his age he could be the son of Robert and Mary.
Brick wall time...
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Jenny