Who were Sir Arthur Conan Doyle's siblings?

Yeah he did and two wives. He was kinda cheating on his first wife, but still loved them both at the same time.

By Louise Hawkins ("Touie") his first wife, he had Arthur Alleyne Kingsley [known as Kingsley] and Mary.

By Jean Leckie, his second wife, he had Adrian, Denis, and Lena Jean [known in the family as Billie. She became Dame Jean Conan Doyle for her services as Commandant of the Women's Army Air Force in World War Two.]

None of his children had children.

Touie had tuberculosis and for some reason (medical advice?) Doyle and she no longer shared a bed. We don't know if he had sex with Jean before Touie's death (Louise lived 12 years or so after the diagnosis), but they were 'an item' for years.