"
This suggests to me that she is of the age (52) to be the wife of her mother's brother and that indeed her mother's maiden name was Haddon."
lol

oh dear (sigh), this is what happens when I try and respond to things late at night! (I'm an hour ahead of UK time) Sorry. What I was trying to work out was whether the visitor was Margaret Sinclair's (nee Haddon) sister in law, ie. married to Margaret's brother.
This is particularly funny and embarrassing all at once because English is my first language, the subject I read at University and the profession I engaged in for 15 years (broadcaster). So while I'm cringing at my ineptitude under the influence of neuro-toxins, I'm also delighted that I'm still fallible and need to work on my clarity. lol
I missed seeing an 's' for single in the column which also explains why I was heading down the 'Haddon by marriage' trail. hehe
Ok, so if I'm clear now (god everything is crossed now!), the visitor should be the unmarried sister of Margaret Sinclair (nee Haddon). Love ya Jane, thanks for your patience.
exhale..........
Thanks again Jane and Northern-rose for the suggestions about finding the Scottish marriage. I'm no expert at Scottish genealogy and when I did the obligatory 'googling' found that I could not search without paying a fee and so put the idea in a shoebox (so to speak) to tackle when a bit less overwhelmed.
The suggestion to try the Scotland General board is ideal and I will do that next.
I'm not going to tie this lovely topic off with a 'completed' ribbon quite yet. I'll see what I can find out on the Scotland list and come back here and let you know what I find.
Heartfelt gratitude and thanks for your time and patience.
Kirsten