Frances, from a website about Delaware County history (http://www.countyhistory.com/doc.dela3/071.htm) I got the marriage dates as: James Charman & Mary Ann Rodman 20 Feb 1852 Muncie, Indiana James Charman & Caroline Rodman9 May 1874 Muncie, Indiana
I believe James' daughter May (Mrs McPhee) was adopted.
James was born 22 sep 1831 and baptised 26 Oct 1831 in Wisley, Surrey the son of Arthur Charman and Rebecca Garton. From the same Delaware County web site, I belie Caroline and Mary Anns parents were Job Rodman and Catherine Williamson - Job being born in Pennsylvania makes it unlikely that he had a son Samuel born in Surrey.
there were apparently sisters Mary Louise (Minne) Rodman and Mercy Rodman.
If you give me the approx date/place for your Samuel, I'll look out for him in the UK censuses.
I have about 10,000 Charmans on file, so if you'd like any more, please let me know.