Isabel - from what you say you must either be Ina-May's daughter (I didn't know she had one) or else my Mum's recollections are going to pot and there's another daughter out there somewhere!
My name is Allan McBain, My dad is John McBain (1918), whose mother was Johan Aitken (m John McBain), who was Willie & Isabella's 7th Daughter. My Grandad had the good fortune to marry two of the Aitken daughters - he married Mary after Johan died in 1928.
Guess we're related then ;-)
I can do you a GEDCOM of my lot if you like and would love anything you can send me. Is your e-mail still the curtis103 one?
I've tried to get beyond Thomas & Isabella Marr, but with no luck so far. They appear on the 1881 census as both being born in St Monans(ce) in 1819ish and 1820ish respectively.
I'll not write too much now until we compare notes.