Yerkes Saurman b 1791 PA m Martha Brown/Wade

Looking for information on the family of Yerkes Saurman listed on the 1850 Philadelphia Co, PA census Second Ward Spring Garden Family 513/538:

Saurman, Yerkes, 60, collector and agt, PA
Martha (Brown/Wade), 55, NY
Maria, 30, PA
Abner H, 24, PA
Rebecca, 17, PA
Amanda, 17, PA married Theodore Evans 1860 Moniteau Co, MO
Madison G, 14, PA

Yerkes is the son of Peter and Margery Yerkes Saurman.