I'm not sure I have a connection with your Clarks - although I am a Clarke. I noticed that one of the wives was a Milstead. My Great-Great Grandmother was Margaret Elizabeth Milstead, daughter of Mary Hammill and William Milstead. Margaret was born in 1833 in Occoquan Virginia. (which is right outside Fairfax County) She Married William Green Clarke from Prince Georges County. They married in Laurel Maryland in 1855.