Desperately trying to find some info on Silas Davis married to Johanna Schoonhoven Van der Mark. They're my 3rd great-grandparents. Only known info is that they lived near Gettysburg and were buried there or near there in late 1830's. Both Silas and Johanna, along with 5 of their children died of cholera between 1834 and 1839. Son Henry (2nd great-grandfather), along with some siblings, moved to IN after parents death. This is NOT the Silas Davis married to Ruth Demoss. Am at a brick wall.