The Hopkins-Arnold Family of Durango, Colorado

I am researching several lines of the Hopkins-Arnold Family Tree right now I am searching for information and ancestors for the following (details for each person follow):

William Riche/Richie/Richey and wife Mary Sifers or Sickles(abt. 1820-1880 in OH,IN & MO), Capt. Thomas B. Walker (abt. 1835-1900 in MO,IA & NE), Col. Benjamin White Johnson (abt. 1830-1900 in ??, OH, IA, NE), Stephen Weston (abt 1665-1741/2 in Berkshire & Exeter, Devon, England), Richard Sleech (abt 1650-1700 at Eton, Oxfordshire, England), Wykeham or Fiennes (Oxfordshire 1405 and 1665), John Hopkins (abt. 1869-?? England & Ontario, Canada), Christopher Kiernan (abt. 1825-18?? in Ireland, NY, VT, ??)

William Riche/Richie/Richey m. Mary Sifers or Sickles (born VA) and they had a daughter Charlotte Ann Riche b. 1843 Crawfordsville, IN; m. 1856 in MO, Robert D.L. Miller; lived in Petersburg, IL d. 1923 - interested in any information on this family.

Looking for ancestors of Capt. Thomas B. Walker (1837-1909; with Union Cavalry for Civil War) and Col. Banjamin White Johnson (1823-1902; fought with 111th Ohio infantry)

Ancestors of Christopher Kiernan b. near Dublin, Ireland m.1st in Wisconsin abt 1849; dissappeared about 1865 and never hear of since - interested in ancestors or any info regarding life after 1865 (2nd marriage or family?)