Son of Frederick and Lydia Draper. He traveled with his parents and siblings. Both Frederick and Lydia were included in the Wimmer company report. According to census records, the Van Leuven family lived in Missouri in 1850. Anson was born in Missouri in 1851. By 1860, the Van Leuven family had traveled to and settled in California. His birth date and death date are both confirmed by the inscriptions found on his gravestone.