I find these possible relatives in the 1870 San Jose, Santa Clara Census. I believe that they are related to Richard BROWN, my 2nd great grandfather. Richard and Margaret are in the 1860 Anderson, Mendocino, CA census living with Albert BRAYTON and family. Richard died in Mendocino in 1860. He was born in VT 1792. Seems likely that this is the same Margaret.
Roger's family in the 1870 census: wife, Ellen; children, Warren, Ernest, and Susan.