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I'm curious as to your source of information for Charles b. 1772. The Simon Foglesong you mention as his fathr was baptised in 1715, but born in 1711, and he died in Germantown, Pennsylvania (Philadelphia) about 1791/92. This information is from the Germantown Historical Society in Philadelphia. They have no record of children for him and his wife, whose name was not Sussannah. I have information on Charles being married in Frederick County, Va, but if his fathers name is Simon, then is is the son of Simon Foglesong who came over in 1765, and therefore he was not born in Germany. It is also possible that Charles is the son of George Foglesong and his wife Elizabeth. They lived in Frederick County, VA (Stephen City) from about the mid 1760's.
My big concern about your Simon d. 1801 being the father of Charles is the age he and his wife would have been when they had Charles, which for the wife would have been 47 years of age, which is unlikely.