My ggg grandparents were William McGowan a fisherman and Winifred Boyle b. c. 1802 from Ballyshannon. Winifred's father was Edward Boyle a blacksmith and her mother was Mary Tierney. I found Winifred and six adult children - Patrick, William, Matthew, Anne, Margaret and Catherine in the 1861 Scottish Census. They were not in the 1851 Census, but I did find a marriage certificate for her son Patrick who married Margaret McMillan / McMullen in 1856, so I would imagine the McGowans moved to Glasgow sometime between 1851 and 1856. I have been unable to find any record of William in Scotland so feel he may have died before they moved.
I know records were not kept until 1864 in Ireland but maybe someone may know this family.