As a small boy, my late father (1900-1991) met his great-grandmother Helen Davidson (Paton) Wallace (1825-1913) in 1908 at Chatham, Kent. She was a tiny snow white-haired lady in black who greeted him: "I put my hand upon your head; and say, God bless you! God bless you!" Much that follows was gathered through the kindness of an English cousin, and of two Boston colleagues; and from FIBIS, the IOR section of the British Library site, and ScotlandsPeople, also Ancestry census images.
Charles Paton's wife Christian Henderson (1802-1827, m. Calcutta 1820) was his first cousin. His parents were William Paton & Elizabeth Wilson; hers, Alexander & Christian (Paton) Henderson. William Paton (1759-1795) & Christian (Paton) Henderson (1771-1854) were children of William Paton (d. 1810) & Christian Scott (ca. 1730-1824) of Lonmay/Rathen, Aberdeenshire (near Fraserburgh and Peterhead). See BURKE'S LANDED GENTRY, 8th ed. (1894), pp. 2254-55, down to both Charles Paton and Christian Henderson.
Helen Davidson Paton was named for a cousin--Helen Eliza (Paton) Davidson (1802-1852), w. of Thomas Reid Davidson (d. 1851), later British resident at Nagpur. Mrs. Davidson was dau. of Col. John Paton (1763-1825, another son of William & Christian [Scott] Paton) and w. Mary Forbes (her sister Jane [Forbes] Ryan [later Mills] was the sponsor at Jane Ryan Paton's christening at Ettrick).
Alexander Wallace, husband of Helen Davidson Paton, b. ca. 1814; Helen's 1913 obituary calls him "of Peterhead, later of Calcutta." His father Fraser Wallace was chr. Strichen, Aberdeenshire, 1785, and m. Jean Walker there 1808. Wonder if some of them were Scottish Anglicans? I don't see them in available Ch. of Scotland OPRs. Fraser Wallace was son of Alexander Wallace & Margaret Gray (m. Strichen 1784, all from OPRs at ScotlandsPeople, also IGI). "Alexander Wallace, merchant of Calcutta, grandson of Alexander Wallace, farmer in Mormond, 1847" (Services of Heirs, Scottish [Edinburgh], 1847) (David Dobson, THE SCOTS OVERSEAS: EMIGRANTS AND ADVENTURERS FROM ABERDEEN AND NORTH EAST SCOTLAND [Pt. 1] [St. Andrews, 1993], p. 30). Mormond is in Strichen.