I wish I had seen your query earlier. Margaretha is one of my wife's ancestors and I have some information that might be helpful. If you have anything on her ancestors, I'd be very interested also.
Margaret Moock was born September 19, 1846 in Klingenmunster, Germany, and died September 09, 1931 in New Orleans, LA (Mrs. Gary's). She married John Henry Petermann on 1870 in New Orleans, LA.
More About Margaret Moock:
Burial: Abt. 1931, Osyka, Mississippi (German Cemetary).
Occupation: Owned a bakery with a brother in New Orleans, LA.
Property: Owned boarding house in Gainseville on Pearl River.
More About Margaret Moock and John Henry Petermann:
Marriage: 1870, New Orleans, LA.
Children of Margaret Moock and John Henry Petermann are:
+Charles R. H. Petermann, b. August 20, 1880, Osyka, Missippi, d. May 1957, Natalbany, LA.
+Frederick Jacob Petermann, b. Abt. 1872, Osyka (Pike), Mississippi, d. October 24, 1956, Harvey (NO), LA.
+Louise Petermann, b. July 03, 1878, Osyka (Pike), Mississippi, d. September 10, 1934, Moss Point (Jackson), MS.
+John Henry Petermann, b. February 07, 1875, Osyka (Pike), Mississippi, d. July 13, 1953, New Orleans, LA.
+Julius Henry Petermann, b. August 18, 1882, Osyka (Pike), Mississippi, d. Abt. 1976, Gulfport, MS.
William Christopher Petermann, b. February 18, 1885.