My OPR transcriptions list 6 children to James LINDSAY and May/Marjory SIMPSON -
John Chr 9 Oct 1805
Peter Chr 30 Nov 1806
Alexander Chr 27 Jan 1811
George Chr 8 Aug 1813
David Chr 22 Jul 1815
Walter Chr 5 Jul 1818
The 1841 Census shows Marjory living with David and Walter, presumably James has died. The 1851 Census shows all the sons and their families all living in Denhead.