« Reply #6 on: Friday 25 September 20 15:06 BST (UK) »
The best source for Scottish records is Scotland's People. ( This is where the original records can be found. The likes of FindMyPast and Ancestry can be useful finding tools).
I would suggest the following. The death record found by Sandra in 1894 ought to name Thomas Rogerson's parents.
The 1861 census for Thomas appears to show a youngest son George, aged 5. There is a birth for George Rogerson showing in Scotland's People: 1855 820/84 Dryfesdale. 1855 was the year that statutory registration started in Scotland. In that year the records are remarkably detailed. George's birth record ought to tell you when Thomas and Agnes were married.
William
Dent (Haltwhistle and Sacriston), Bell and Jetson (Haltwhistle), Postle, Ward, Longstaff, Purvis, Manners, Parnaby and Hardy (Co. Durham), Kennedy and McRobert (Banffshire), Reid(Bathgate), Watson (Wemyss), Graham (Libberton), Sandilands (Carmichael), Munro (Dingwall)