No further specific info is available re Galloway. Maybe Alexander Galloway's father married twice? I will keep an eye out for any Galloway information.
I was trying to find info regarding Margaret McHarg, wife of William Sproat, b 20 Apr 1762 in Rattra, Borgue, Kirkcudbright, d 10 Sept 1832 Old Abbey, Paisley, Kirkcudbright. William is the son of Hugh Sproat, b 14 Apr 1723 christened in Twynholm lived Templand, Borgue m 27 Nov 1760 in Muncriag, Borgue, Kirkcudbright to Barbara Houstone, b 1730 Muncraig, dau of William Houston and Marianne Carson or Samuel Houston and Barbara Cowan.
Do you have any info on Sproat McHarg family or where buried?