I also have David McNeil b. 26 Sep 1833 in Barony, Lanarkshire, s/o Neil McNeil & Agnes Brown. However, I have that he m. a Margaret Wilson in Jan 1853 in New Monkland, Lanarkshire [LDS]. I wonder if Margaret Wilson died, and David remarried to your Elizabeth Brown on June 25, 1867 in Bridgeton, Glasgow?
David's brother, William McNeil b. 27 Mar 1837 in Barony, Lanarkshire, m. Jean "Jane" Duncanson b. 06 Jun 1845 in Clyde, Glasgow, Lanarkshire, on 13 Sep 1867 in High Church, Glasgow, Lanarkshire. Jean "Jane" Duncanson was a sister to my great grandmother, Helen Duncanson b. 09 Apr 1860 in Clyde, Glasgow, Lanarkshire. Helen Duncanson m. George Sutherland in 1883, and they came to the US in 1883 and 1st settled in Long Island City, Queens Co., NY.
I sure would like for us to share our data. If you would like to contact me, please do so at firstname.lastname@example.org