Theodore Roosevelt was born on October 27, 1858, in a four-story brownstone at 28 East 20th Street, in the modern-day Gramercy section of New York City, the second of four children of Theodore Roosevelt, Sr. (1831–1878) and Mittie Bulloch (1835–1884). He had an elder sister Anna, nicknamed "Bamie" as a child and "Bye" as an adult for being always on the go, and two younger siblings—his brother Elliott (the father of future First Lady Eleanor Roosevelt), and his sister Corinne (grandmother of newspaper columnists Joseph and Stewart Alsop).
The Roosevelts had been in New York since the mid-17th century. Roosevelt was born into a wealthy family; by the 19th century, the family had grown in wealth, power and influence from the profits of several businesses including hardware and plate-glass importing. The family was strongly Democratic in its political affiliation until the mid-1850s, then joined the new Republican Party. Theodore's father, known in the family as "Thee", was a New York City philanthropist, merchant, and partner in the family glass-importing firm Roosevelt and Son. He was a prominent supporter of Abraham Lincoln and the Union effort during the American Civil War. His mother Mittie Bulloch was a Southern belle from a slave-owning family in Roswell, Georgia and had quiet Confederate sympathies. Mittie's brother, Theodore's uncle, James Dunwoody Bulloch, was a United States Navy officer who became a Confederate admiral and naval procurement agent in Britain. Another uncle, Irvine Bulloch, was a midshipman on the Confederate raider CSS Alabama; both remained in England after the war. From his grandparents' home, the young Roosevelt witnessed Abraham Lincoln's funeral procession when it came through New York.