Family
- father Robert Williams: Worked for Lincoln-Mercury; born c. 1901; died in 1987
- mother Laurie Williams: Born Sep. 24, 1922; died on Sep. 4, 2001
- son Zachary Williams: Born in 1983; mother, Valerie Velardi
- daughter Zelda Williams: Born July 31, 1989; mother, Marsha Garces Williams
- son Cody Alan Williams: Born on Nov. 25, 1991 in San Francisco; mother, Marsha Garces Williams
Companions
- wife Marsha Garces Williams: began relationship while she was working as his personal assistant; married on April 30, 1989; second wife; her third marriage; born c. 1957; of Finnish and Filipino extraction; formed Blue Wolf Productions with Williams; one of the producers of "Mrs. Doubtfire" (1993)
- Michelle Tish Carter: together c. 1984-86; sued Williams for $6.2 million claiming he gave her herpes during their two-year relationship; Williams countersued Carter for extortion
