Once again you are a wee diamond.
And that is so promising with old Isabella being alive in 1861, poor woman aging 30 years in only 20, I have days like that!!!
I realise now I have been muddying my waters by popping in the maiden name in my DC searches. I've had *s everywhere imaginable to try and come up with the variations of Margaret Isabella McAllister (nee MacKintosh), however, by putting in just a plain and simple Is* M*Allister born 1791 with a 10 year margin of error gets me 6 matches........now to get the £6 to get at those matches.....mmm...how to disguise this habit on the bank statement?????
As I'd drawn a monumental blank on William and realised he'd popped off our mortal coil way before 1855, I'd popped him to one side until I came up with the most gobsmacking inspiration which may help me find him....that could take some while!
......Now to find just whose daughter young Isabella is. I've found a 6yr old Isabella in 1841 (admittedly only on freecen so there are probably umpteen out there I don't know about), living in Brewery St, Barony, parents Daniel & Catherine, siblings Helen & William. Naming patterns spring to mind and this Daniel is listed as a Rope-maker Journeyman, my William McAllister was a Ropespinner.......but they are in limbo as I've not managed to prove or disprove a link.
First things first...hopefully an informative death cert awaits 8-[ Please let the informant have actually know something about them. [-o<
Thanks very much once again Jack,
All the best
Donna