Returning to the 1861 entry for Mary Robertson, widow of George senior and the family which included James allan's father:
I've been checking on the visitors who were from Scotland hoping for some family connection to give us some clues.
Jane Eleanor Fielding was married age 29 b Glasgow
Janet Buchanan L Evering? unmarried no age b Glasgow
Jane Eleanora Leckie Ewing married Thomas M Fielding at Kippen Stirling in 1856 (parish record from Scotlandspeople)
She was born 3 Feb 1832 and chr 8 March 1832 at Barony Lanark, daughter of William Leckie Ewing and Eleanora McFarlane.
William Leckie Ewing and Eleanora McFarlane married 28 June 1826 in Edinburgh parish. Other children were:
Robert Chr 18 Oct 1830
John Leckie 28 May 1833
Helen Catherine 21 June 1837
Isabella Leckie 5 Oct 1829
all chr at Barony.
William Leckie Ewing was chr 3 June 1798 at Kippen Stirling, son of Robert Ewing and Isobella Leckie. Other child found was:
Janet Buchanan Ewing b. 30 Jan 1796 chr 13 Feb 1796 Kippen.
A Janet Buchanan Ewing married John McFarlan 10 Nov 1819 at Campsie Stirling.
the Janet Buchanan L Evering? in 1861 could be William Leckie Ewing's sister hence Jane Fielding's aunt??
William Leckie Ewing and Janet Buchanan Ewing's mother was Isabella Leckie. Her parents could have been William Leckie and Janet Buchanan or Andrew Leckie and Agnes Buchanan.
William Leckie Ewing's wife Eleanora McFarlane was chr 11 Dec 1801 Edinbugh, parents, John McFarlane and Christian Wardrob!
Unfortunately no obvious connection to our Robertsons but the same tradition of passing maternal surnames down. As a teacher and mother of kids doing exams I frequently use Leckie and Leckie notes on Scottish examination subjects.

Heads swimming, back to the Robertsons.
Jo