Your going to have a problem locating them and it probably will require a bit of old fashioned legwork rather than online lookups. Your at a time just prior to PA mandating recording of vital records. So to learn anything about these two children is going to come from some other "than the usual" source.
Were I you, I would first try to contact the church itself and see what you could find there. (you didn't include the name of the church, so I couldn't do any kind of info search on them)
Also try the local historical/genealocial society. They may have some church records, old newspapers, even possibly family file folders.
If your not local to that area, try roagk.org to see if there's a volunteer in that area that could help you out.