It appears Nancy [KERR] MC LAUGHLIN was omitted from Samuel KERR's bio....she IS mentioned in his will which was probated 3-23-1882......enjoy
http://familysearch.org/pal:/MM9.3.1/TH-1942-27614-24055-78?...BTW John/Nancy had no children. Thomas A JOBS/JOBES was either a relative, or a foster child.
Also, he was born before they were married......in case you want to amend your tree.