From the 1850 census, George is either an illigitimate child of Susan or is someone else's child since he was born after Susan's husband died in 1836. Also, he is not listed in George Muma's Will
1850 census, MD, Baltimore Co., 8th Ward of Baltimore, 9th August 1850
Susan Mumma, 45, b. MD, illiterate
David Mumma, 22, b. MD, butcher, illiterate
George Mumma, 10, b. MD,
Father:George MUMMA (b. 24 FEB 1800, Baltimore, MD - d. JAN 1836, Baltimore, MD) Mother:Susan LEDLEY (b. ABT 1805, MD - d. 28 OCT 1853, Baltimore Co., MD)