Hello! I just came across this thread and I see that we come from the same blood line. I am a descendant of Constantine A. McNeill.
A relative had sent me numerous pages on descendants of Constantines. In the paper it states that Mary Doherty was born in 1811, however, there is no date of death.
If there is any info that you would like to know, please feel free to ask. I will try my best to help.