there is no way joseph williams and mary phoebe little can be james williams that married nancy west parents. and that john williams and mary keeling be this joseph that married mary's grandparents. check this web site out.
http://www.usgennet.org/usa/mo/county/stlouis/williams/#Jose...
as you can see,that joseph married henrietta jouett. now i do have them in my family tree but not as james parents either. to my knowledge james parents were jenkins williams and uriah marks and james grandparents richard williams and margaret eaton jones. this is why i went with what my grandmother and aunt mollie had as his parents. after they told me i confirmed this on lds.
james is traced back to robert williams of wales and gwen cadwallader of pennsylvania.