Reply #2 had this link to German Archives and has records of emigrants from Hanover who emigrated in the 1840s. This website has been upgraded since I first saw it and now very difficult to view.
http://aidaonline.niedersachsen.de/The .pdf attachment has the DEGENHARDT family highlighted, and shows
(1) the names of the four brothers (brüders)
(2) years of birth
(3) occupations
(4) parents
(7) destination
I have cross referenced them from SA records:-
1. (Johann Carl)
August; J. Augustus born 9 Aug 1818 Clausthal, Hanover, died Feb 1870 Norwood SA
2.
Friedrich; (Johann Heinrich) aged 33 when married 1855 - German archives says born 1821
3. (Georg)
Carl (Christian); aged 25 when married in 1853 - German archives says born 1826
4.
Gustav (Julius Wilhelm); age 22 when married in 1849 - German archives says born 1828
Transcribed passenger lists that are online have mistakes. Johann Carl Ludwig aka Louis did not emigrate on the Patel in 1846.
Essie