This post is for Sandra Singleton Founds...
I sent the information you gave me on Margaret Carney and William Founds to my "unofficial family biographer", and got this response-
"I do have William (bc 1835 in PA) and Margaret (bc 1838 in MD) in my
database along with children Henrietta (bc 1865 PA), Amer P [I have him as
Amos] (bc 1871 MD), Clara (bc 1872 MD), Philip T (bc 1873 MD), and Ella May
(bc 1879 MD). All I have on this family is the 1880 census (Cecil Co, MD),
but I probably have more, later, censuses as I collected all references to
the Founds name in all censuses and made photocopies of most, but have never
had the time to sit down and in-put the data except for our own branch.

Based on the current information, William is from one of the Chester County
families -- that is where all the other Cecil & Harford Co MD Foundses come
from. Since he should be in his parental family in the 1850 census, I could
probably figure it out fairly soon..."

Do these dates match with your Margaret and William?