Hello, my 2nd great grandfather, John Gamm was born in 1830 in Mecklenburg. We believe he is the 3rd John Gamm from the area. Possible his father or grandfather is related to Dorothea. Afraid I have not had any luck researching my German anceatry. His mothers name was Magalina and wife Sophia. Both from Mecklenburg. Oh and have birth for Magalina as 1802.