Henry was the fifth of seven sons born to James and Helen Nicol Nisbet. I have done a deep dive into his life, and those of his descendants, and found the story has all the elements of blockbuster novel: Madness, murder, and a hint at infidelity.
I have collected together all I know about Henry and put into a document which can be found here: Notes on the Life of Henry Nisbet and His Descendants
Family Lore by Ian Nisbet Ross 