Q1: Are Diane Keaton and Michael Keaton related by blood or marriage?
No. Diane Keaton and Michael Keaton share no familial connection. Diane was born Diane Hall in California, taking her mother's maiden name to join Actors' Equity. Michael was born Michael John Douglas in Pennsylvania, selecting the surname from a phone directory to join SAG.
Q2: Was Buster Keaton the father or grandfather of Diane Keaton?
No. Buster Keaton (born Joseph Frank Keaton VI) had two sons, Joseph and Robert, with his first wife Natalie Talmadge. Neither child had any connection to Diane Hall's family tree.
Q3: Why couldn't Michael Keaton use his real name in the Screen Actors Guild?
Actor Michael Douglas and daytime television host Mike Douglas were already registered with the union when Michael Keaton joined in the mid-1970s. SAG bylaws explicitly prohibit multiple working members from sharing an identical professional credit.
Q4: Did Michael Keaton legally change his surname to Keaton?
No. Michael Keaton has maintained Michael Douglas as his legal name on his driver's license, passport, and financial documents throughout his life. "Keaton" functioned solely as a trade alias.
