Family
- grandfather Gordon Cranmer: Maternal grandfather; raised Kelsey after his parents divorce; died of cancer when Grammer was 11
- father Allen Grammer: Divorced Sally Grammer c. 1957; Grammer did not see his father for 15 years; met only twice before father's 1968 murder; was murdered on the front lawn of his home in the U.S. Virgin Islands
- mother Sally Grammer: Divorced Allen Grammer c. 1957; took Grammer to live with her parents in New Jersey; died July 7, 2008 at age 80
- sister Karen Grammer: Born c. 1957; raped and murdered in Colorado Springs, CO in 1975
- half-brother Stephen Grammer: Died while scuba diving in 1980
- half-brother Billy Grammer: Died while scuba diving in 1980
- half-brother John Grammer: Sold the story of Grammer's underage-sex allegations to the tabloids
- daughter Spencer Grammer: Born in 1984; mother, Doreen Alderman
- daughter Greer Kandace Grammer: Born Feb. 15, 1992; mother, Barrie Buckner; Grammer doesn't see her because of strained relations with her mother
- daughter Mason Olivia Grammer: Born Oct. 24, 2001 via a surrogate mother; mother, Camille Donatacci
- son Jude Gordon Grammer: Born Aug. 28, 2004 via a surrogate mother; mother, Camille Donatacci
- half-sister Betty Grammer:
- grandmother Evangeline Cranmer:
Companions
- Barrie Buckner: had affair with Grammer while he was living with Cerlette Lamme; mother of Greer Grammer
- Cerlette Lamme: born c. 1960; performed with the Ice Capades; met in 1985; together for seven years, separating in 1992; sued Grammer for libel over comments in his book
- Tammi Alexander: posed for Playboy; engaged to be married in March 1994; separated in June 1996 after allegations of an affair with an underage babysitter surfaced
