Douglas Emhoff is the husband of Kamala Harris. He was born to Jewish parents Michael and Barbara Emhoff in Brooklyn, New York. He lived in New Jersey from 1969 to 1981, moving with his family to California when he was 17. Emhoff graduated from the California State University, Northridge and USC Gould School of Law. He married film producer Kerstin Emhoff (née Mackin) in 1992; they divorced in 2008 after 16 years and two children. He married Harris on August 22, 2014, in Santa Barbara, California, with Harris's sister Maya Harris officiating.

Emhoff is an entertainment litigator and began his career at Pillsbury Winthrop's litigation group. He later moved to Belin Rawlings & Badal, a boutique firm, in the late 1990s. He opened his own firm with Ben Whitwell in 2000. The firm was acquired by Venable in 2006. Emhoff joined DLA Piper as a partner in 2017, working at its Washington, D.C., and California offices. Following the announcement that his wife would be Joe Biden's running mate in the 2020 United States presidential election, Emhoff took a leave of absence from the firm. After the Biden–Harris ticket won, the campaign announced Emhoff would permanently leave DLA Piper before Inauguration Day to avoid conflict of interest concerns.
Cole MacKin Emhoff is the stepson of Kamala Harris through her marriage to Doug Emhoff. He was born September 15, 1994, to Kerstin Emhoff and was named after jazz musician John Coltrane. Emhoff graduated from Colorado College with a bachelor's degree in psychology. Emhoff was an assistant at William Morris Endeavor before becoming an executive assistant at Plan B Entertainment. Emhoff calls Harris "Momala". He married Greenley Littlejohn on October 14, 2023, in a Los Angeles ceremony that was officiated by Harris.
Ella Emhoff is the stepdaughter of Kamala Harris through her marriage to Doug Emhoff. She was born May 29, 1999, to Kerstin Emhoff and was named after jazz singer Ella Fitzgerald. In 2014, she was in the music video for Bo Burnham's song "Repeat Stuff". In 2018, Emhoff graduated from high school in Los Angeles where she was on the swim team. She is an artist majoring in apparel and textiles at Parsons School of Design. Emhoff calls Harris "Momala". She designed her inauguration day dress with designer Batsheva Hay.

Maya Harris is the younger sister of Kamala Harris. She was born in Champaign-Urbana, Illinois and raised in the San Francisco Bay Area and Montreal. She had her only child Meena Harris at the age of 17. Harris completed a Bachelor of Arts at University of California, Berkeley and earned a J.D. degree from Stanford Law School. She works as a lawyer, public policy advocate, and a television commentator. Harris married lawyer Tony West in July 1998.
Meena Harris is the niece of Kamala Harris. She was born in Oakland, California in 1984. Harris completed a bachelor's degree from Stanford University and a J.D. at Harvard Law School. She is a lawyer and children's book author. She founded a campaign to raise awareness on social policy issues. Her 2020 children's book is based on the life story of her mother and aunt. Harris and her husband Nikolas Ajagu have two daughters.
P. V. Gopalan (1911 – February 1998) was the maternal grandfather of Kamala Harris. Gopalan was a career civil servant, eventually serving as Joint Secretary to Government of India in the Ministry of Labour, Employment and Rehabilitation. He was later deputed to the Government of Zambia and lived in Lusaka as Director of Relief Measures and Refugees, to help Zambia manage an influx of refugees from Southern Rhodesia (now Zimbabwe). Gopalan and his wife Rajam were from Tamil Nadu state and had wed in an arranged marriage. They had four children. Their eldest daughter Shyamala became a scientist in the United States and Canada. Their son Balachandran received a PhD in economics and computer science from the University of Wisconsin–Madison and returned to an academic career in India. Their daughter Sarala is an obstetrician who practiced in the coastal city of Chennai, India. Their youngest daughter Mahalakshmi is an information scientist, who worked for the Government of Ontario.
Gopalan Balachandran, the uncle of Kamala Harris, studied at St. Xavier's College Calcutta, University of Calcutta and the Imperial College London. He obtained a PhD in Economics and Computer Science from the University of Wisconsin in 1978 with dissertation devoted to Financial regulation of decentralized economies. He was a consulting fellow at the Manohar Parrikar Institute of Defence Studies and Analyses, Delhi. He was married to Rosamaria Orihuela Basurto in 1980.
Sharada Balachandran Orihuela is the first cousin of Kamala Harris. She is an Indian Mexican born in Mexico to Rosamaria Orihuela and Gopalan Balachandran. She started formal education in New Delhi and moved frequently between India, Mexico, and the United States. After moving to Oakland, California for college in 2001, Balachandran Orihuela's aunt, Shyamala Gopalan, helped her cope with race relations in the aftermath of the September 11 attacks and later influenced her intellectual trajectory. Balachandran Orihuela graduated from

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Kamala Harris is of Jamaican descent on her paternal side and of Indian descent on her maternal side. Donald J. Harris wrote in an account of his family ancestry that the Harris name comes from his paternal grandfather Joseph Alexander Harris, a land owner and agricultural produce exporter, and that his paternal grandmother "Miss Chrishy" (née Christiana Brown) was a descendant of both enslaved Jamaicans and Hamilton Brown, a plantation and slave owner. However, Snopes, a fact-checking website, rated this claim as unproven pending further research. In July of 2019, Snopes noted that Harris made errors in some of the vital dates he provided for births and deaths of his grandparents. The following year, PolitiFact stopped short of Snopes's unproven rating, and again reviewed the validity of the story, saying about the Stanford professor emeritus's claim that he is the descendant of the slave owner, "I would be inclined to believe him."

Harris' maternal ancestral home is the village of Thulasendrapuram in India, in which her grandfather P. V. Gopalan was born.