I appear to be the 2nd gt grand nephew of your your g-grandfather. his daughter Rosanna maried Alexander wilson robb and I am his 2nd g-grandson. Have info only for Rosanna she was 5th out of 9 children to james philip and rosanna rainy. It would appear from your posting that the family emigrated no wonder I have kept running into a brick wall.
Hope we have a connection.
Bill & Rosie Adams in Sri Lanka