Sources: (1) The Scottish antiquary, or, Northern notes & queries, page 95, year of publication 1886, vol. 8, edited by The Reverend A. W. Cornelius Hallen, M.A.
(Colonel) Richard Maitland of the 3rd Foot Guards, said to belong to the family of Soltra, was appointed ensign in the regiment in the service of Holland, commanded by (Colonel) James Maitland, by commission date at Namur 15th July, 1695.
He married (firstly) Margaret Allan, and had issue, viz.:
(1) Robert Richard Maitland, served heir to his brother, Henry Maitland, 10th April, 1738,
(2) Pelham Maitland, also served heir to his brother, died at Edinburgh, 7th September, 1795, having had issue---Thomas Pelham Maitland, born at Dalkeith, Midlothian, Scotland, near Edinburgh, on 30th April, 1754 - [and I am willing to bet that it is was this child that was mislabelled as HENRY PELHAM MAITLAND -- "baptised Old Musselburgh Episcopal, dated September 24th, 1755, son of Mr. Gilbert Grierson, of Dalkeith".],
(3) Obrian Maitland, also served heir to his brother,
(4) Henry Smith Maitland, died before 10th April, 1738,
(5) ELIZABETH MAITLAND, married (Sir) Gilbert Grierson, [4th Baronet], of Lagg.
(Colonel) Richard Maitland married (2ndly) Elizabeth BELL, daughter of James BELL in Glasgow, Scotland, niece of Robert BELL, writer, Edinburgh, Scotland, and had issue, viz.:
(6) James Maitland, served heir to his mother, grandfather, and grand-uncle in 1750....continuing with the Griersons