Thanks for the post! John Langton and Martha (nee Downing) Langton had 4 sons: Alvin Andrew.(b. 1856), Fred Leslie. (b. 1866), John H. Jr (b. 1864), and William Byron (b. 1854); and Ida M. (b. 1871) It seems all the children were born in Plover, WI. Also, John Langton, Sr. served in the Civil War (1860's) He was in the E Co. 18th Regiment Infantry. He suffered from heat stroke and was also held prisoner (though we can't find him on any prisoner records).
John Langton came into America through Niagra/Buffalo NY. We're having trouble getting anything further back.
I'm sure we have some more information, just have to gather it together.