I'm looking for info on August Zahn of Saxony, Germany married Ernestine(a) Aust (?). Had a son named Conrad Zahn born in Saxony 1861 or 1862 and Conrad emigrated to US I think between 1880 and 1888. He is not in 1870 or 1880 census but is in the Lawrence MA directory from 1888-1892. I found Conrad once listed as Zahm in the 1920 census and I know by the address he is my great grandfather. I don't know if August and Ernestine ever emigrated or not. I can't find the ship registry to show when Conrad emigrated either. Any help would be appreciated.