I have reviewed your genforum posting of 11/1/2009.I may have information of use to you or I may only obscure the facts.On 12 Sep 1750, head of household Johannes Foeller (~1718-1774) arrived in Philadelphia aboard the "Priscilla."His family included at least two young sons, Andreas Foeller(~1749-1818) and Peter Foeller (~1747-1801).The evidence that Andreas and Peter were not born in America is the record of naturalization (as subjects of the Crown) in 1765.
Johannes Foeller(~1718-1774) settled his family near Allentown, PA.My line descends from Andreas Foeller(~1749-1818).In the 25 years I have worked Feller(s) history, I have been amazed that I have had almost no contact with researchers of the Peter Foeller(~1747-1818) line.I know of only one researcher of the Peter Foeller(~1747-1801) line and I have had no contact with her for several years.However, she has supplied me with a very copy of his very informative will.
Peter Foeller(~1747-1801) grew up in PA and married Catherine there.Most, if not all, of their seven childrenwere born in PA.At some point the family moved to VA, where Peter Foeller(~1747-1801) died in Franklin County.All seven children are believed to have completed their lives in VA, but only one in Bedford County.
One child Peter Feller(b~1784) married Mildred Mason in Bedford County, VA on 27 Aug 1814.He also died in Bedford County.Hence the time is right and the location is right for Peter & Mildred to have parented your John Fellers(1822-1890).
To tie these families together definitively, I suspect you will have to find records of the Lutheran/Reformed Church in Bedford County.Before 1850, the US census will likely be of no help.
You should look at the 1870 census for Knox County, MO.You will find additional children of John & Elizabeth (Betsy) Feller.If you will give me a mailing address, I will send my file and a copy of the will of Peter Foeller(~1747-1801)