The son of Solomon da Silva Solis and Benvenida de Isaac Solis, Daniel was born in London in 1784. He came to the United States in the first decade of the nineteenth century along with his older brother Jacob. These two Sephardi merchant brothers became some of the first Jews to settle in Delaware. In New York, in 1814, Daniel married Sarah Norris, daughter of Eden and Ann Norris, and they raised their five children in Wilmington. With such a miniscule Jewish community, however, Solis turned toward Philadelphia for religious communal matters, affiliating with Congregation Mikveh Israel.