I am looking for information on Joseph Latham who married Mary Guy. I believe Joseph Latham's parents were James Latham and Ann P. Martin (no proof, but 1 census record). I am looking for the parents of Mary Guy.

Here is what I have:
Descendants of Mary Guy

1 Mary Guy 1843 - b: September 1843 in Maryland
.. +Joseph Latham 1832 - b: September 1832 in Maryland m: December 13, 1859 in St. Mary's Co., MD
.... 2 Cora L. Latham 1863 - b: Abt. 1863
.... 2 Maria A.B. Latham 1866 - b: Abt. 1866
.... 2 Susan R. Latham 1869 - b: Abt. 1869
.... 2 Mary E. Latham 1871 - b: Abt. 1871
.... 2 Ella Josephine Latham 1878 - 1946 b: August 11, 1878 in St. Mary's Co., MD d: March 17, 1946 in St. Mary's Co., MD
........ +Ernest Judson Wheeler 1874 - 1958 b: February 25, 1874 in St. Mary's Co., MD d: April 27, 1958 in St. Mary's Co., MD m: December 31, 1894 in Sacred Heart Church, Bushwood, MD
.... 2 James Albert Latham 1880 - 1945 b: April 1880 in St. Mary's Co., MD d: 1945 in St. Mary's Co., MD
........ +Alice Maud Wheeler 1881 - 1954 b: 1881 in St. Mary's Co., MD d: 1954 in St. Mary's Co., MD m: December 25, 1899 in Sacred Heart RCC, Bushwood, MD