De Haro married Emiliana (Miliana) Sánchez, who was the granddaughter of José Antonio Sanchez, one of the soldiers of the 1775
de Anza expedition. She was the sister of Alcalde
Francisco Sanchez and Alcalde
José de la Cruz Sánchez. The marriage produced twelve children, including a pair of twin sons and a pair of twin daughters. Miliana Sánchez died in 1842. The couple's twin sons, Francisco and Ramon de Haro, the 1844 grantees of
Rancho Potrero de San Francisco on
Potrero Hill, were murdered by
Kit Carson at the age of 19 on June 28, 1846, near
San Rafael, California, along with their distant cousin
José de los Reyes Berreyesa. Kit Carson (and potentially other men) shot the 3 men at the direction of General
John C. Frémont. De Haro died on 28 November 1849 and is buried at the
Mission Dolores cemetery in San Francisco. ==Legacy==