Looking for any info on Gordon and Anna Hart

They are buried in Mitchell Cemetery, Melbourne
Harrison County, Missouri, and had at least two infant daughters that died in 1869 and 1874.

Gordon Hart,1842-1892
Anna Hart, ????-????

http://www.findagrave.com/cgi-bin/fg.cgi?page=gsr&GSiman...

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=ha...;

Other Harts buried there are:
Corydon Hart, 1830-1923
Elizabeth Brown Hart, 1833-1894
Sarah Hart, 1902-1903
Thomas Hart, 1899-1900
Sophia Ellen Hart, 1851-1922

Does anyone know anything about this family?

If Gordon is my Gordon, they were in Hunt County Texas at one point.

Thank you, God Bless!