Hi Annie,
Thanks for your interest in helping me.
Yes I have all their birth records and only the mother Mary Cochrane is listed.
Siblings were - Janet born 4/12/1859 - Clackmannan
Mary born 23/8/1861 - Sauchie
Isabella born 23/8/1861 - Sauchie - twin of Mary - she does not appear to have
lived long.
Duncan born 20/8/1865 - Clackmannan - Birth record has him as
Duncan Ferguson Cochrane
Margaret born 30/10/1871 - Alva
In all the relevant census records it shows head as Mary Cochrane and the children as Ferguson.
No, Duncan Ferguson never appears in any of the census records with Mary Cochrane or the children.
Yes, I have found 1 Duncan Ferguson who would fit the bill - Duncan Ferguson born Comrie about 1827 and listed in census records for 1841, 1851, 1861, 1871, 1881 and 1891 as a farmer in the district of Monzievaird and Strowan. His mother was named Janet (as 1st daughter) was. His death certificate shows him as single

I can't seem to find any other Duncan Ferguson who fits the bill.
I live in Edinburgh so know that these distances are ok - maybe he caught up with Mary when he brought the "coos" to market

My gut tells me that this is the correct gentleman

Maybe I just need reassurance.
Thanks,
Dorrie