Sir Henry Baskerville is Sir Charles Baskerville's nephew.
Sir Henry Baskerville who spent most of his life in Canada.
Albert Henry Baskerville was born in 1883.
Dr.Watson stayed with Sir Henry in the Baskerville Hall.
John Baskerville died on January 8, 1775 at the age of 68.
Charles Baskerville's next of kin was Sir Henry Baskerville, his nephew and the heir to the Baskerville estate.
He was the dead uncle of Sir Henry Baskerville. Sir Henry had been living in Canada, and he had been summoned to London as he was to inherit the Baskerville estate valued at 740 thousand pounds (well over 10 million pounds today).
The Baskerville family tree in the Hound of the Baskervilles include Jack Stapleton, son of Rodger Baskerville II, Hugo Baskerville, Henry Baskerville, and Charles Baskerville. Also in the family tree are Beryl Stapleton, wife of Jack Stapleton.
The only first names of the Baskerville clan mentioned in the book are: Charles, Henry, Hugo, Rodger, John, and Elizabeth. Sir Henry being the resident of Baskerville Hall during the story.
Sir Henry Baskerville himself raises the issue of the missing boot at the hotel.
"On the death of Sir Charles we inquired for this young gentleman [Sir Henry Baskerville], and found that he had been farming in Canada." -- Dr. Mortimer, 'The Hound of the Baskervilles
Stapleton was his fictional name made up so the Baskerville family would not know who he was. He was the son of Rodger Baskerville who was one of the brothers of Sir Charles Baskerville, which makes him a Baskerville too.