Murray
Not sure where the possible name for James' mother has been sourced. The original image on the Old Parish Register entries may say more but Scotlands People is only showing William Blain and no more for parents. The children showing for a William Blain include
1 05/09/1742 BLAIN JEAN
2 27/03/1744 BLAIN WILLIAM
3 05/07/1747 BLAIN MARY
4 03/11/1749 BLAIN ROBERT
5 30/12/1752 BLAIN JAMES
6 11/04/1757 BLAIN DAVID
All entries are in Barr. It is unclear whether these are birth or christening entries from the index.
You will find on IGI that actual extracts from the OPRs for Barr are one of those frustrating batches (batch no. C115802 1689-1820) where only girls have been loaded. To get more complete details (i.e. the boys

) you need to check on Scotlands People.
On a personal opinion, I would say that the submitted entries on IGI showing mother as Mrs William Barr have simply been put in as a matter of filling in the box by whoever submitted the information. I wouldn't read too much into that at this stage.
I cannot see a marriage for a William Blaine (with wildcards for spellings) in Barr searching between 1728-44. There is only one marriage/bann entries showing for a William Blain anywhere in Scotland. Given what you know of the family, the place names are possible/interesting:
02/11/1732 William Blain and Elisabeth Ferguson in Inch (Wigtown) /WIGTOWN 886/ 0010 0084
30/11/1732 William Blain and Elizabeth Fergusson in Ballantrae/AYR 579/ 0010 0186
Banns would normally be read in Parish that the bride and groom were living in at the time of the marriage. The above two could both be banns or the last could be the marriage. As always with these OPR entries, you don't know what is there until you look.
Monica
