John Kapp, born in New York in 1860, lives in 1880 with his paternal grandmother, Louisa Weber, in Albany. She and his father were born in Prussia. She had previously identified herself as being born in Mecklenberg and Hamburg. I am assuming that Louisa, born abt 1812, was widowed and remarried to Henry Weber, with whom she appears in Albany in 1850. I cannot find John's parents, nor, for certain, John after 1880. Louisa died about 1891. Henry died in the early 1870s.
In 1870, it appears that my grgrandmother, Mary Weber, lived with Louisa and Henry. In the 1890s, Louisa lived with Mary and Mary's husband, George Holler. I have not found Mary's parents and hope that the Louisa connection might help.