I did a bit more searching in my records and found some more information for you. I was unable to find the record of Johann’s birth but the record for his brother Lorentius gave the following: Volk Lorentius born 1832 Feb 25, Mannheim, son of Benedict Volk (son of Ioannis Volk) and Sibilla (daughter of Wilhelm Bader). Also; Barbara Bader daughter of William Bader and granddaughter of Georg Bader, marriage 1830. I also have lists for Mannheim for 1828, 1821 and 1816. If these are of interest.