Grimshaw Family Genealogy Forum
The 1880 U.S. Census shows John and Mary (both age 53) living in Philadelphia with their 15-year-old son, Joseph. John is shown as a weaver, and Mary is engaged in "keeping house." Both were born in England.
A summary of the record is shown in entry PA-2 on the following webpage of the "Grimshaw Origins" website:
The record is located on LDS Family History Library Film 1255184 (National Archives Film T9-1184 Page 269B.)