Notes:
In the 1790 census, apparently David and Barbara are not living together
1790 Census, Patapsco Lower Hundred, Baltimore, MD
1) page 253 from the book, "The Ancestry and Some Allied Lines of Helen Doris Heddinger (as of 9 March 1994)," by Wall, Hannelore (Hanna) Gessert, (Spring 1994) 247-258.
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064 Michael Heddinger/Hettinger, b/ 1735, Germany, d. 16 Apr 1801, Baltimore, MD, he m: 2nd Barbara Mumma
Barbara Mumma married Michael Hettinger on 29 Sept 1793 per the marriage records of the First German Reformed church of Baltimore. This likely the 2nd marriages for both of them.
Book WG-74-513 Michael Headinger conveyes the, "Darley Hall", to his wife, Barbara
Barbara leaves this property to her children (named below) by a letter written 7 Jan or June 1804. This is likely just before her death.
Book WG-85-185 - Jacob Mumma, William Mumma, Bryan O'Loughlin and Catherine his wife, Caspter Depperich and Barbara his wife, Samuel Taylor and Sarah his wife, and Mary Mumma - all heirs of Barbara Hedinner or Headinger of Baltimore Co. ( The heirs all lived in either Baltimore Co. or Baltimore City) were selling "Darley Hall" to William Patterson on 3 June 1805.
A question remains,were all of these children from the marriage of Barbara to David Mumma? Since she married David Mumma in 1783 and he was out of the house by 1789