I have been working backwards from CA for the Manley family.
I had a reference to Riley in an old history of the Pit River area in early 1900 before the families were moved when they created Lake Briton.
I also had an early census that listed a Riley Manley in a boarding house in Ohio.
I have a possible family for their parents. Lebbens Manley b Sep 1809 MA and Polly Mary Johnston
I haven't verified yet with census records etc. But Lebbens' line goes back to England. I found the pedigree at World Connect