I have a copy of a marriage certificate fora Selina Peden, who fits some of your information from 2001. It lists her marriage date as Oct. 1, 1875, Glenboig, Scotland to Samuel Craig. This marriage certificate says she was 18 in 1875. I am also a great granddaughter. A cousin has been doing some research which he has passed on to me.Are you still working onthis branch of family history? I would be interested in exchanging info with you.