Forfarian, ok thanks for that. It may be a long time before I get to Scotland, but when I do I want to have as much information as possible when I go to each place of ancestry significance.
Thank you for referring me online to "marriage with deceased wife's sister". Very interesting.
[Could it be that the earlier wife had simply left him rather than died, so in the eyes of the law he was still married? ]
I am wondering that myself.
Donald McDonald and Margaret Sinclair married in November 1838 in Brechin.
Margaret, her mother Isabella (55) and sister Ann (15) are with him in the 1841 census with a 6 year old child George Pilmer who Margaret brought to the marriage with her. (There is an 1836 record of James Pilmer and Margaret Sinclair having an illegitimate child, George Pilmer.)
In the 1851 census Margaret is no longer listed in the household. Isabella and Ann are still there. There is a son Charles 8 - by Margaret with Donald, born August 1842. George Pilmer is listed again - aged 15 and is now called stepson. I wouldn't have thought Margaret would have taken off and left him, but I suppose its possible.
By 1861 Donald's mother in law is no longer living in the household, but there are now 2 daughters - Scotlandspeople records that their father is Donald, mother Ann Sinclair. The deaths I mentioned in my first post that I have records for - are Donald, Ann and their 2 daughters Georgina and Isabella Jnr - all in the 1870s.
Its been a twisted tale, part of which being that it appears Donald had a twin sister, Margaret McDonald who had a 'lawful' son, John Bain to James Bain in 1850. John appears in the Donald McDonald household in the 1851 census as 'nephew' aged 1, and again in the 1861 census aged 11 - this time as 'son'. Either Donald's sister Margaret and her husband James had died or they have 'disappeared' too. Both Margarets are McDonalds at some stage of their lives, but I have been unable to find out what happened to them.
Apologies for all the names and dates, but just in case someone has the inclination to go digging - it will save going over old ground - and also explains some twists and turns.