SCHAFF, John and Mary 1870 census

Researching ALL the Schaff's living in this county. I am in
belief that John and Peter were brothers. John was married to Mary and had Margaret, Kate, John, Mary and Anna. Peter
and Margaret eventually moved to the Detroit area with their children Christina,Edward,Margaret and Peter Alvis.
John and Peter both came from Luxembourg, unknown when?
Both wives were from Prussia.John was born in 1831 and
Peter in 1835. ANY help or any info would be most appreciated!! Maybe there is a living Schaff in Washtenaw County that can help me! Contact me at [email protected]
Thank you!!!!