Hi JAP
Yes, you are correct about the paper trail we have - so far

I have the OPR marriage for David Balharey and Margaret Jaffrey, m. 20/04/1855 Dundee
Margaret is detailed as the daughter of Tho. Jaffrey, Shoemaker
Stat Death of Benjamin Franklin Balharry d. 31/05/1870 aged 21 Montrose, Forfar.
Parents detailed as David Balharry & Margaret Jaffrey
1841 Census for Forfar, showing Benjamin Franklin Batharry aged 12, born in Chile.
1841 Census for Dundee, showing Adam Balhary, aged 7, born in Angus, living with Jean Jaffrey.
I really don't believe it's too much of a leap to assume these are all linked but I do wish I could find something more on David and Margaret.
I need to get Maria to try to research as you suggest JAP - this probably hasn't occurred to them because they've always assumed a generation further on.
Re the 'link' between David and Margaret Jaffrey and the David who married Benigna Nunez - the only thing this is based on is the assertion from my cousin that 'her' David's mothers' maiden name was Jeffers or similar (she was unsure about spelling and of course it's probably contorted slightly over the years). Again it is understood the father of David, who married Benigna, was also David.
I am aware of the IGI for Jose David Balharry, but frustrated by the fact that I can't trace any other records for baptisms prior to that, for Benjamin Franklin for example.
Is it just me or are all these Davids confusing?
Lass x
Note: I've just realised that, unlike the other entries on the same page as David and Margaret's marriage, there is no occupation noted for David.