Thank you.
That was rather what I feared.
I am looking for evidence one way or the other to prove or disprove a hypothesis regarding the parentage of one James Leslie, and if all of Janet's brothers had predeceased William, that would have been the evidence to disprove it.
I've now seen the original Latin document, which just has the usual phrase 'Gulielmus Lesslie frater Janetae Lesslie filia de mortui Joannis navarchi in Dundee obijt ad fidem et pacem S D N Regis Et quod dicta Janeta Lesslie latrix praesentium est legitima et propinquior haeres Lineae dicti quond Gulielmi Lesslie fratris ejus', which doesn't get me any further.
For the record, the alleged parents are John Leslie and Elspet McKie, whose family, all baptised in Mortlach, Banffshire, were
Janet 20 May 1744
John 1 November 1746
James 8 August and 3 September 1748
William 7 April 1750
Isobel 20 December 1752
Elisabeth 16 September 1755
Patrick 29 November 1760
According to a document I have received, John Sr was the son of Robert Leslie, master mariner in Banff, and John Jr became a farmer at Denside of Montrose.
It would be more than strange if John Leslie, shipmaster in Dundee, was the head of a family all born in Mortlach, which isn't even near the coast, let alone near Dundee.
'My' James Leslie married Jean Spence on or shortly after 13 January 1764 in Mortlach. If he was the son of John L and Elspet McKie, he was only 15 on the day of his marriage, which is not quite impossible but not at all likely.
He is in the 'census' of Mortlach in 1805 with children who died after 1855, so if all of Janet and William's brothers had died by 1789, then 'my' James could not be their brother.