Thank you Frank for your recent reply. Unfortunately, we already know the Cassie Skinner / Colin Skinner Matheson information. Colin is my husband's grandfather.
The dilemma goes further to George Gordon Matheson (who married Catherine Skinner), whose father was Neil Matheson and his wife, Dorothy (Dora) Gordon. Dorothy, we think, was Neil's second wife and we have been told that George Gordon was raised by Dorothy's spinster aunts when she perished when George Gordon was about 2 years of age. So, when & where did Dorothy die, and why was George Gordon raised by the aunts? They are listed as living in his household in the 1871 & 1881 NS census.
So, back to you if you have other information about Dorothy.