Notes:
Catharine and George Mason are found in the 1840 census of Baltimore in the 2rd district living next to her brother, John Mumma. The first 3 of their children are recorded, but there are an additional male and female in the household, the same age bracket as Catharine and George. The female is likely her sister, Ann.
In the 1850 census, Ann Mumma is listed as living with her sister, brother-in-law and their children in Baltimore. There a difference in age of 1 year between Ann and Catharine. No husband is recorded for Ann, Therefore we might conclude that Ann never married,
1860 Census, MD, Baltimore, 12th district., p. 104
George Mason, 65, $2500 real estate, $800 personal, b: MD
Catherine " , 62, b: MD
Joseph " , 23, farm laborer, b: MD
Carvil " , 20, farm laborer, b: MD
Catharine " , 17, b: MD
Nancy Mummy, 60, b: MD
Jacob Mason, 70, b: MD
Jacob Ross, 72, farm laborer, b: MD
1870 Census, MD, Baltimore, 12th District, dwellinng 978 & 979
Mason, Catharine, 62, keeps house, $2000 real estate, $125 personal, b: MD
" , Virginia, 26, seamstress, b: MD
Mason, Joseph, 33, gardener, $4000 real estate, $500 personal, b: MD
" , Catherine, 30, keeps house, b. MD
" , George, 4, b: MD
[+ 4 other people who are workers in the garden, all born in Germany]
1880 Census, MD, Baltimore, 12th District, dwelling 333
Mason, Catharine, 83, widowed, gardener, b: MD/MD/MD
" , J. Thomas, 42, widowed, son, gardener, b: MD/MD/MD
" , Carville, 40, son, married, gardener, b: MD/MD/MD
" , Georganna, 31, dau in law, married, keeping house, b: MD/MD/MD
" , George Arthur, 14, grand son, at school, b: MD/MD/MD
" , Wesley W., 1, grand son, b: MD/MD/MD
" , Virginia C., 35, dau, b: MD/MD/MD
" , Robert F., 1, grand son, b: MD/MD/MD
Jackson, John, black, servant, farm hand, b: MD/MD/MD
Catharine and George Mason are mentioned in a writeup for their son, Benjamin. "Biographical History of Northern CA", page 350
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"Benjamin D. Mason was born in Baltimore, MD, March 1, 1834, son of George and Catherine (Mumma) Mason. In 1852 he came on the steamer, 'Prometheus' via Nicaragua to CA. He married Elizabeth Zimmerman, a native of IN (parents native of PA) in Placerville, 19 Jan 1875. He died at age 75 in El Dorado County, 28 Dec 1908. Elizabeth Mason died age 79 in El Dorado County Apr 26 1922.