* Diane Hubbard: She has publicly criticized Scientology and its practices. She was estranged from her father for many years.
* Quentin Hubbard: He was a member of Scientology but left the organization in the 1980s.
* Ronald DeWolf Hubbard Jr.: He was also a member of Scientology, but he passed away in 2016.
Therefore, none of L. Ron Hubbard's children are currently active members of Scientology.