.... He was married in the 1820s in Aberdeen, so likely was born in the early 1800s. The information we have is that he was born in the Dunnottar area.
They married in Sept 1828, St Nicholas Aberdeen - he was a Slater.
According to the Census (1841 to 1881) - David is consistently showing a birth of 1808, Fetteresso (the 1861 alone says Stonehaven).
Mary consistently shows as born 1809, Musselburgh (in 1851 says Dalkeith)
They have a few more children than you listed:
Ann 1833 (June)
Margaret 1835
William 1837
David 1839
James (twin) 1842
Mary (twin) 1842
John 1844
Andrew 1846
Jane 1849
The issue as listed all appear in at least 1 or 2 of the Census - their dates listed here:
http://familytreemaker.genealogy.com/users/f/l/e/Sara-Fleming-Manchester/WEBSITE-0001/UHP-0068.htmlMiddle name of Andrew is given on the site as 'Whichard'.
Also listed a twin of Jane, as "Yses" a girl (who isn't on the census).
I would also suspect there was a child born and died before Ann (a big gap otherwise between Sep 1828 marriage and Jun 1833 birth of Ann) - possibly it was a boy named James (meaning the twin James was later given the same name, also a tradition). Was Mary HURRY's mother named Ann? The pattern of the children suggests her name would be.
Trees on A* - has his death cert (which is the next step to finding his origins) :
David SCOTT, married to Mary HURRY, died 5 Oct 1885 age 77 at Woodside, Father: James SCOTT , Slater (deceased) and Margaret SCOTT ms KEMLO (deceased).
Also has their Banns document - one of the Witness' was an Andrew Wishart, Sailor - and I'll bet their son Andrew was named after him - ie middle name more likely to have been "Wishart" not "Whichard" . The Banns document also notes Mary's father was William HURRY Bell manufacturer.
SCOTT is a common name overall, and the names of the children are common - as often is the case in Scotland where there is a strong tradition of naming children in the Scottish naming pattern using family names. It is this pattern, locations and occupations which can often help identify family connections, especially once moving back beyond 1855 and into the old Parish records (or not, if they were not regular Church of Scotland but were Catholic, Weslyan, Baptist, Quaker etc). A common name overall may not be so common in for example, one small village or hamlet etc. Occupations were often handed down from father to son - so it is not unexpected to find David's father was also a Slater.
The presence of twins in the children once & maybe twice - may also prove a clue, if the gene is from James' side.
So taking the names of his parents from his death certificate and going to the IGI:
MARRIAGE - Extracted
James SCOTT & Margaret KEMLO married 4 Dec 1803, Dunnottar.
Cheers
AMBLY