Derastus was born on May 9th, 1832. Derastus' father was Jacob Deem Jr and his mother was Margaret Hill. His paternal grandparents were Jacob Deem Sr and Eva Ann Cox. He had a brother and two sisters, named Elliott, Louisa and Rosenah. He was the youngest of the four children. He died at the age of 87 on May 30th, 1919.