Hello, I am replying to the last post by C McElwaine. I have been researching the McIlwaine family for over 35 years, and can confirm that Sir Robert's parents were definitely, Henry McIlwaine (1833-97) and Matilda McFall. Henry, was a brother of my great great grandmother, Mary Ann McIlwaine (1831-1908) who married Alexander McAllister in 1853.
I would really appreciate if you could help me in my quest to find Sir Robert McIlwaine's descendants, as so far no one has responded to my earlier post on this thread.