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William Lorimer
born - c1814 (census/death cert) Fordyce
Married - Elspeth Black, 30 July 1836, Boyndie (she is also c1814, so put them both approx 22)
death - 25 Mar 1889, Boyndie
(Children's naming patterns seem to be all maternal side except a 'William' - no John or Isabel)
From death certifcate -
he's "Illegitimate"
"Reputed Father" is "John Lorimer (soldier)"
Mother is "----- Begg (later Ogilvie)" [first name blank]
both were deceased
informant was his Son
So... checked Fordyce KSM between 1813-1817 - nothing with a Beg/Begg.
Marriage Ogilvie/Beg, 12/12/1823 Fordyce (wrongly indexed as James - reported)
John Ogilvie and Isabel Beg
Children
John Ogilvie/Isabel Begg, Fordyce between 15 Feb 1824-1 Sep 1838 - That did make the Fordyce KSM, Antinuptual Fornication

Isabella Begg/Oglivie death 14 April 1873, aged 72, Husband John - informant, parents William Begg and Jane Williamson, born 6 Jan 1800. No mention of any possible Lorimer marriage, just to rule that out.
So... she was 14 when she had William??? Nothing in the KSM, and at 14 I would have expected some mention, forget illegitimate. I'm starting to doubt the Death Cert info...
No William Begg births with mother Beg/Begg between 1800-1824 in Scotland
There is a -
William Lorimer birth 12/1/1819, Fordyce but he'd be 17 at 1836 marriage...
John Lorimer/Isabel Brodie m 1816 Fordyce
children between 1817-1825
He wouldn't be illegitimate, but Begg/Brodie?

And no marriage between Lorimer/Brodie and Oglivie later.
So can anyone see anything I have missed?