Rebecca is not listed as Wiliam's wife in the 1860 census. Her name is mentioned in the History of Washington Co., MD, Vol. 2 by Thomas J. C. Williams, published 1906 by John M. Runk & L. R. Titsworth
Spouse 1:William H. MUMMA (b. 18 AUG 1815, Washington Co., MD - d. 22 MAR 1872, Grand Detour, Ogle Co., IL)
Children:
1. Joseph MUMMA (b. 10 FEB 1835, Washington Co., MD - d. 16 JUL 1881, Grand Detour Twp., Ogle Co., IL)
2. Rose Ann MUMMA (b. 23 APR 1836, Washington Co., MD - d. 18 MAR 1926, Lee Co., IL)
3. Henry MUMMA (b. SEP 1839, Pine Creek Twp., Ogle Co., IL - d. 11 NOV 1853, Grand Detour, Grand Detour Twp., Ogle Co., IL)
4. Elizabeth MUMMA (b. 24 OCT 1839, Pine Creek Twp., Ogle Co., IL - d. 6 NOV 1853, Grand Detour, Grand Detour Twp., Ogle Co., IL)
5. Jacob MUMMA (b. 28 FEB 1842, Pine Creek Twp., Ogle Co., IL - d. 2 JUN 1902, Los Angeles, CA)
6. William MUMMA (b. ABT 1845, Pine Creek Twp., Ogle Co., IL - d. 1852, Grand Detour, Grand Detour Twp., Ogle Co., IL)
7. John MUMMA (b. JAN 1847, Pine Creek Twp., Ogle Co., IL - d. 1927, Denver, CO)
8. Nancy MUMMA (b. MAY 1848, Pine Creek Twp., Ogle Co., IL)
9. Amanda MUMMA (b. 4 JUN 1851)
10. infant MUMMA
11. infant MUMMA