Reading the older posts on this thread I noticed the long gap between the marriage date of Duncan McFarland and Ann Livingston (1756), and the first birth found for their children (1790). Also, female married 1756 would have been born possibly no later than 1740, making her beyond child bearing age by 1790. Found marriages for two different couples with the same name.
1. Duncan McFarland and Ann Leviston or Livingston, 30th May 1756 at Glendevon, Perthshire. (Previously posted)
2. Duncan McFarlane and Ann Livistone, 24th Sep. 1789 at Old Kilpatrick, Dumbartonshire. (More likely couple)
Placed the births previously posted (with one addition) in order. Dates are from OPR Birth Index - ScotlandsPeople and will be BAPTISM date, not the birth date. Several spelling variations for both surnames.
Isabel McFarlane b 26 Apr. 1790 Old Kilpatrick, Dumbartonshire.
Parlane McFarlane b 8 Jan. 1792 Old Kilpatrick.
Ann McFarlane b 19 Oct. 1793 Old Kilpatrick.
Mary McFarlane b 19 Oct. 1793 Old Kilpatrick.
John McFarlane b 15 Sep. 1795 Old Kilpatrick.
James McFarlan b 25 Apr. 1797 Od Kilpatrick.
Christian McFarlan b 13 July 1800 Logie, Perthshire.
Margaret McFarlane b 4 July 1802 Logie, Perthshire.
Christian McFarlane b 20 Sep.1804 Glasgow, Lanarkshire.
Isobal McFarlan b 17 May 1807 Old Kilpatrick.
Duncan McFarlane b 29 Jan. 1809 Old Kilpatrick.
Janet McFarlane b 16 Sep. 1810 Old Kilpatrick.
Rebecca McFarlane b 5 Nov. 1815 Old Kilpatrick.