Catherine Rupp 1823-? m/ Joseph Schertzer 1820-? PA

I am trying to discover who the parents were for Joseph Schertzer. I know that he was born around 1820 in Pennsylvania.
He married Catherine Rupp (Rupt) who was born in 1823 in the Lancaster/York County region.They were married around 1841 or 1842 as their first child Mary Elizabeth was born in 1843.

The 1900 census states that there were 12 children and 7 living.
I know of 8 of them:
Mary Elizabeth 1843-?
Cornelia 1845-?
Elenora 1849-aft 1910 married ? Landis and a widow in 1910
Joseph1857-?
Kate1860 - ?
Frank E. 1861-aft 1910never married
Peter R.1865-aft 1910never married
George Washington 1867-1942

George married Catherine Boyd Smith in 1897 in Philadelphia. Did any of the other family members stay in the Lancaster area or did they join George?

Would love to hear from anyone who might have information on this family,